Sparkfun

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US$27.93
This is a simple serial to USB board that works with the nRF24L01, nRF2401A, and RF-24G Nordic transceivers. Comes with an ATMEGA328 preloaded with code that allows the transceivers to act as pass through serial devices (sends 4 characters at a time).
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US$1.33
This has the same number and spacing of pins as the Raspberry Pi so you can easily connect via ribbon cable to the low-level peripherals and get hacking! 
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US$4.13

This 2x13 flat ribbon-cable fits the GPIO headers on the Raspberry Pi so you can easily connect to the low-level peripherals and get hacking! 

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US$4.55
This is a 1" tall 4-digit 7-segment display that is big enough to see from a distance but not so big that you'd have trouble finding an enclosure for them.
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US$4.13
These common-cathode displays feature 4 x 7-segment digits and one decimal point per digit.
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US$2.45
 These 1" tall 4-digit 7-segment displays are big enough to see from a distance but not so big that you'd have trouble finding an enclosure for them.
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US$2.45
These common-cathode displays feature 4 x 7-segment digits and one decimal point per digit.
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US$1.95
These are standard 0.1" spaced header pins that can be surface mounted for applications where through-hole pins won't work. The surface mount side of the legs are staggered for stress relief.
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US$1.95
These are standard 0.1" spaced header pins that can be surface mounted for applications where through-hole pins won't work. The surface mount side of the legs are staggered for stress relief.
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US$0.96
These are standard 0.1" spaced header pins that can be surface mounted for applications where through-hole pins won't work. The surface mount side of the legs are staggered for stress relief.
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US$0.96
These are standard 0.1" spaced header pins that can be surface mounted for applications where through-hole pins won't work. The surface mount side of the legs are staggered for stress relief.
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US$5.69
This product consists of two separate parts, the panel-mount jack and the mating plug. The plug has a ring which screws to the panel-mount connector ensuring a solid connection that won't pull off.
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US$20.93
By using an arrangement of surface-mount headers to "intercept" the incoming pins and shift them around, the TransmogriShield takes the SPI and I2C lines from their new, less convenient, homes at the ICSP header and D2/3 pins, and moves them back into classic Arduino position: SPI on D11-13 and I2C on A4/A5.
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US$2.41

This is made to work with the Arduino Uno R3, Leonardo and new Arduino boards going forward. They are the perfect height for clearing the USB-B connector and great for stacking multiple shields. This kit includes 4 headers (2x 8-pin, 1x 10-pin and 1x 6-pin), enough to connect a shield to an Arduino board.

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US$23.73
These USB-B type connectors are housed in a molded plastic assembly with O-rings and panel gaskets to keep your panel mount USB connection not only dust proof, but waterproof as well.
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US$1.06

10 pin stackable female header for multiple applications. Pins have 0.1" spacing. Pins are 10.5mm (0.42") in length.

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US$23.73

The new version of the Ardubot PCB breaks out all the Arduino pins to a separate row of headers. It also includes spaces for LEDs, a reset switch, and servo headers.

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US$7.81

These DC powered heating pads are perfect for near-body heating applications. They get warm to the touch but not too hot. Simply apply 5VDC to the wire leads and within minutes, the pad will begin to warm up.

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US$6.85

These DC powered heating pads are perfect for near-body heating applications. They get warm to the touch but not too hot. Simply apply 5VDC to the wire leads and within minutes, the pad will begin to warm up.

Delivery within 2-3 weeks
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US$16.39
This kit designed for the beginner. It has a low parts count so even young kids can easily complete it. Once it's put together the red LED "eyes" light up brighter or darker according to how much light is getting to the photosensor.
Delivery within 2-3 weeks
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US$41.93
The LilyPad SimpleSnap is a new, easy way to create e-textiles projects with LilyPad that are modular and can be disassembled or broken down, it's also a great way to prototype! The SimpleSnap board is similar to the LilyPad Simple board, and has the same functionality except for two major differences: A built-in rechargeable Lithium Polymer battery and female snap connectors.
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US$7.43
Even though it's as small as some of the LilyPad sensors, this board actually has an ATtiny microcontroller on it so it's actually pretty smart! Simply sew on 4 LEDs and connect a battery and the LEDs will twinkle-fade (a lot like fireflies... or lightning bugs, if that's what you call them).
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US$11.13
This is 95 pieces of heatshrink tubing of different colors and diameter in 10cm length. Heatshrink can be use to reinforce connections, protect devices, and electrically isolate exposed solder joints.
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US$0.70
This is a plastic 90 degree bracket that can be used on a servo. Note: These are sold in singles. No additional hardware is included.
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US$0.70

This is a plastic holder for mounting a mini metal gearmotors. Note: These are sold in singles. No additional hardware is included.

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US$8.33
This is a breakout board design to use the MAX3232 chip. This is the RS232 converter IC that is capable of running at 3V and communicating with 5V logic.
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US$9.73
This is a compact battery pack for providing power to any electroluminscent wire, panel or tape. This little black box takes two AA batteries and has two JST connectors for your EL wire/panel/tape. There are two modes: continuous on and flashing and it even has a belt clip!
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US$5.41
This simple on-off switch is rated for 20A at 12V but who cares about all that, it looks way awesome. These toggle switches come with those missile switch covers that make your project look like something out of a spy movie.
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US$4.46
This simple on-off switch is rated for 20A at 12V but who cares about all that, it looks way awesome. These toggle switches come with those missile switch covers that make your project look like something out of a spy movie.
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US$2.10

Features: Small 5x3.2mm footprint. Operating temperature: -40-85C. Frequency Tolerance: +/- 20ppm. 18pF load capacitance. 

Delivery within 2-3 weeks
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US$2.73

This through-hole speaker is great for projects where you need something that sounds better than a piezo buzzer but don't have room for a full-blown speaker. This 30mm diameter speaker is encased in plastic and will handle about 100mW of power.

Delivery within 2-3 weeks
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US$18.13
It's the end of the world, and you need a button to press. This is it. A 100mm diameter (outside diameter) dome illuminated push button comes with an LED, securing nut and a pre-installed long life horizontal microswitch. Button can also be adjusted to a low profile button by removing the middle ring.
Delivery within 2-3 weeks
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US$6.93
Each pack includes 25 tiny 0603 SMD LEDs in cut-tape packaging. These are great for status lights or for building really small LED matrices. 
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US$79.65

This 200 pulse per rotation rotary encoder outputs gray code which you can interpret using a microcontroller and find out which direction the shaft is turning and by how much. This allows you to add feedback to motor control systems. Encoders of this kind are often used in balancing robots and dead reckoning navigation but it could also be used as a very precise input knob.

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US$2.73
When the device is exposed to a magnetic field, the two ferrous materials inside the switch pull together and the switch closes. When the magnetic field is removed, the reeds separate and the switch opens. This makes for a great non-contact switch. This switch can carry up to 1A.
Delivery within 2-3 weeks
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US$2.73
This is a very useful panel-mount locking button/switch. Press it once for 'on', once again for 'off'. It is a SPST N.O. with 7/16" threading. This button has a nice 'click' when you press it.
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US$1.33
This is your standard fridge magnet, perfect for holding up quite a bit of weight. Grade C8. Magnetization is throughout the thickness of the magnet. Dimensions: 0.709x0.197". Features: BrMax: 3850 Gauss. Pull Force: 1.5 lbs.
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US$1.33
This is a 5mm clear infrared LED. These devices operate between 840-850nm and work well for generic IR systems including remote control and touch-less object sensing.
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US$1.33
This is a 5mm clear infrared LED. These devices operate between 940-950nm and work well for generic IR systems including remote control and touch-less object sensing.
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US$4.13

These are high quality Single Pole - Double Throw (SPDT) sealed relays. Use them to switch high voltage, and/or high current devices. This relay’s coil is rated up to 12V, with a minimum switching voltage of 5V. The contacts are rated up to 5A (@250VAC, 30VDC).

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US$4.44
It has a common anode. The display features one decimal point per digit, and individually controllable apostrophe and colon points.
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US$4.13
This is a five way selectable switch often found as the pickup selector on electric guitars. The lever clicks through five different positions so you can select from three different inputs and a combination thereof.
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US$2.99
This pack of female headers includes two 6-pin headers and two 8-pin headers. This is similar to the header kit that comes with Arduino shields except that the pins are shorter so they don't stack. These are useful for Arduino compatible boards that don't come with headers already installed (like the Arduino Pro).
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US$55.93
This is a combination of  3-axis gyroscope and a 3-axis accelerometer on the same onboard Digital Motion Processor™ (DMP™) capable of processing complex 9-axis MotionFusion algorithms.
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US$104.14

This GPS receiver is a complete GPS smart antenna receiver, that includes an embedded antenna and GPS receiver circuits. This low-cost unit outputs an astounding amount of position information 5 times a second. The receiver is based on the proven technology found in LOCOSYS 66 channel GPS SMD type receivers that use MediaTek chip solution.

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US$7.62

This is a 1.75 inch communication cable that connects the EM406 and the EM401.

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US$4.13

This is a 1 foot communication cable extension that mates with the EM406 and EM401.

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US$12.53

This small servo with a standard 3 pin power and control cable and mounting hardware is similar in size and specifications to the Hitec HS-55 model.

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US$4.13

This is a 12 inch servo cable female to female connection with removable plastic shrouds for both ends. This comes in very handy when your servo is further away from the controller than the wire on the servo allows.

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US$4.13

This is a 12 inch servo cable female to female connection with removable plastic shrouds for both ends. This comes in very handy when your servo is further away from the controller than the wire on the servo allows.

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US$29.99

This is a great way to induce linear motion for pushing, pulling or controlling switches and levers. According to the datasheet this solenoid is rated for 36V but they work like a charm at 12V.

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US$11.55
This is a mono audio amplifier that can drive an 8 ohm speaker up to 1.4 watts of power for your audio projects. This tiny audio amplifier is based on the Texas Instruments TPA2005D1. Its efficient class-D operation means low heat and long battery life.
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US$79.75

This rotary encoder has a 1024 pulse per rotation rotary encoder outputs gray code which you can interpret using a microcontroller and find out which direction the shaft is turning and by how much. This allows you to add feedback to motor control systems.

Delivery within 2-3 weeks
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US$10.69

This pan/tilt bracket consists of two brackets and all the hardware you need to attach them to make a pan/tilt mechanism using two servo motors.

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US$1.35
We really like the solid locking feeling and high current rating on these small connectors. This connector mates with our 3-pin jumper wire, and may be useful for interfacing with the popular Sharp infrared proximity sensors or our serial LCDs.
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US$2.73

This is a 12 inch two wire cable with 2 pin JST RE connector on both ends.

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US$2.09

This is a 4 inch two wire cable with 2 pin JST RE connector on both ends.

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US$2.12

This is a 6 inch two wire cable with 2 pin JST RE connector on both ends.

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US$2.73

This is a 12 inch three wire cable with 3 pin JST RE connector on both ends.

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US$2.03

This is a 4 inch three wire cable with 3 pin JST RE connector on both ends.

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US$2.12

This is a 6 inch three wire cable with 3 pin JST RE connector on both ends.

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US$2.73

This is a 12 inch four wire cable with 4 pin JST RE connector on both ends.

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US$2.03

This is a 4 inch four wire cable with 4 pin JST RE connector on both ends.

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US$2.12

This is a 6 inch four wire cable with 4 pin JST RE connector on both ends.

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