Adafruit

US$6.03
This RF adapter bit is great for anyone doing RF work. Depending on the dev-board and antenna you have, you may be faced with either RP-SMA or SMA connectors. Unfortunately they are not compatible! This adapter solves the problem with a RP-SMA jack on one end and an SMA Plug on the other.
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US$34.92

This project pack contains: 2.5 meters (over 8 ft) of high-brightness, long-life EL wire in Red, Pocket EL inverter runs on 2 AA Alkaline or rechargeable batteries (not included), 2 inches of heat shink, both 1/8" and 1/4", 2 inches of copper tape, 2 inches of foam tape.

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US$21.00
We've got 2.6mm thickness EL wire, with a pinkish coat, pre-cut and soldered to a standard quick-connect EL wire. It is made with the latest technology and twice as bright as 'standard' 2.3mm EL - running it at 1.5KHz/90V it emits 115 cd/m^2 or light and a half-life (50% brightness reduction) after 3000 hours of continuous use.
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US$38.42
Yeah, that's right, now you can program and test out your favorite new parts in SOIC-16 or smaller packages. This test socket is good for any SOIC/SOP "Narrow" chip in a 150mil wide body that has 16 pins or fewer. Simply press down on the top, place the chip in carefully and then release to latch the chip in.
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US$52.42
Yeah, that's right, now you can program and test out your favorite new parts in SOIC Wide packages. This test sockets is good for any wide (300 mil) SOIC/SOP with up to 28 pins. Simply open the latch, place the chip in carefully and then close the top over it. The chip is held securely against gold 'fingers' in the socket.
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US$13.13
These particular pins are (in our opinion) ideal because they are skinny enough to fit into proto board or perf board - they have a 1.0mm/0.04" diameter body (the gold part) but the spring contact head is 1.5mm (0.06") wide. The uncompressed length is 16.5mm/0.65", compressed is 14mm/0.55"
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US$6.92
These particular 3.5mm terminal blocks are our favorite: big enough for a range of wire gauges, easy to adjust with a screwdriver, and not too chunky. The only down-side is that they do not fit into 2.5mm spaced holes (they're 3.5mm spaced) - but they do fit in most perf/proto-board if you rotate them diagonally.
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US$1.67
This power jack is designed to fit 2.1mm power plugs snugly and securely. Perfect for adding a power connector to your project. We went for the more expensive "thin pin" type which snap into breadboards or perfboards.
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US$5.17
This power jack is designed to easily attach to a panel up to 8mm thick (0.315" or 5/16") and fit 2.1mm power plugs snugly and securely. Perfect for adding a power connector to your project enclosure.
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US$5.17
These particular 3.5mm terminal blocks are our favorite: big enough for a range of wire gauges, easy to adjust with a screwdriver, and not too chunky. The only down-side is that they do not fit into 2.5mm spaced holes (they're 3.5mm spaced) - but they do fit in most perf/proto-board if you rotate them diagonally.
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US$5.17
Three rows!? Yes! These chunks of 0.1" header has yet-another-row - handy for when you want to connect cables that come in sets of three, like perhaps sensors, or servos. These plug into any standard 0.1" spacing perf-boards or other PCBs and work nicely with our female-ended wire sets.
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US$1.67
This potentiometer is a two-in-one, good in a breadboard or with a panel. Its a fairly standard linear taper 10K ohm potentiometer, with a grippy shaft. Its smooth and easy to turn, but not so loose that it will shift on its own.
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US$2.63
The 74LVC245 is designed so that even when it runs at 1.8V, it still happily accepts 5V signals in one pin and converts it to a lower logic level on the opposite pin. This chip is only for digital signals, it doesn't convert analog signals (you need an op amp for that).
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US$1.67
These small sticky bumpers are our favorite accessory for any electronic kit or device. They are sticky, but not impossible to remove. They're small enough to fit onto any board, and have just enough height to give clearance to thru-hole soldered components.
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US$3.42
Add another 8 pins to your microcontroller using a MCP23008 port expander. The MCP23008 uses two i2c pins (these can be shared with other i2c devices), and in exchange gives you 8 general purpose pins. You can set each of 8 pins to be input, output, input with a pullup or open drain.
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US$5.68
This navigation switch is an intuitive way to add 5 button's worth of interfacing with a single component. Inside is 5 switches: left, right, up, down and 'select' (pressing down), all with a common ground pin.
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US$3.42
A 0.1uF capacitor right next to the VCC pin of your chips will improve stability by filtering out power supply spikes and noise that can cause flaky behavior. We love these little guys, they have 0.1" spacing so fit into any perf or breadboard, compact and good quality.
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US$1.32
977 Adafruit TO-220 Clip-On Heatsink Get the most out of your regulators, transistors and other TO-220 packaged chips by clipping on a heat-sink. Your...
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US$5.17
Three rows in a right angle header!? Yes! These chunks of 0.1" header has yet-another-row - handy for when you want to connect cables that come in sets of three, like perhaps sensors, or servos. These plug into any standard 0.1" spacing perf-boards or other PCBs and work nicely with our female-ended wire sets.
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US$12.47
This connector is sturdy and easy to panel mount, and has pre-soldered wires connected to the 6 contacts (of which 4 are used).
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US$7.00
This socket is designed for DIP chips of up to 40 pins and up to 0.6" wide. So really, its good for any size chip you'll find. What's nice about it is it can snap into an existing circuit board or socket that is designed for a 40-pin 0.6" chip so you may not have to redesign the board! This socket is gold plated so it will last a long time.
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US$3.07
They're what you see on the back of nearly every synthesizer and drum machine. These are nice sturdy jacks, and breadboard-friendly, with all the pins on 0.1" spacing for easy wiring.
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US$1.75
XBees are so cute and tiny but if you're using them in a circuit you'll be annoyed to find that your classic 0.1" headers don't fit them! That's because they use 2mm spacing instead of 2.54mm spacing. That's why you need a special socket like this one.
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US$17.42
The body is made from a single piece of aluminum and has nice knurled grips. The end-cap rotates so you can keep the body steady while rotating. The tip is nicely machined and is magnetic so it holds the miniscule screws in place while inserting/removing them.
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US$3.42
These are standard '130 size' DC hobby motors. They come with a wider operating range than most toy motors: from 4.5 to 9VDC instead of 1.5-4.5V. This range makes them perfect for controlling with an Adafruit Motor Shield, or with an Arduino where you are more likely to have 5 or 9V available than a high current 3V setting.
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US$8.67
This is a great first stepper motor, good for small projects and experimenting with steppers. This uni-polar motor has a built in mounting plate with two mounting holes. 
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US$3.42
Two wires are used to control/power the vibe. Simply provide power from a battery or microcontroller pin (red is positive, blue is negative) and it will buzz away. Works from 2V up to 5V, higher voltages result in more current draw but also a stronger vibration.
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US$1.81
If you need to connect a DC power wall wart to a board that doesn't have a DC jack - this adapter will come in very handy! There is a 2.1mm DC jack on one end, and a screw terminal block on the other.
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US$7.98

Perfect for portable Arduinos, motors, solenoids, 12V LED strips, etc. An On/Off switch lets you control the power right at the source without unplugging. Batteries not included. Dimensions: 1127mm x 71mm x 19mm (5in x 2.8in x 0.76in). Attached lead + plug is 14cm/6in long. Weight (without batteries): 75g.

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US$1.81
If you need to connect a battery pack or wired power supply to a board that has a DC jack - this adapter will come in very handy! There is a 2.1mm DC plug on one end, and a screw terminal block on the other.
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US$5.17
Make a nice portable power pack with this 4 x AA battery holder. It fits any alkaline or rechargeable AA batteries in series. There's a snap on cover and an on/off switch which can be handy when wiring to something without a switch.
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US$6.92
Keep your power source safe and toasty in these waterproof 2xAA battery holders. They're just like classic switched battery holders, but designed for survival! The case has a rubber gasket around the edge of the case (its black and hard to see in the photos but it is there) and attaches together with 4 machine screws.
Delivery within 2-3 weeks
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