Sparkfun

US$15.95
This USB programmer connects directly to the MicroView and lets you not only program the module, but use it to interface with your computer, Rapsberry Pi, or other USB device.
Delivery within 1-2 weeks
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US$49.95
The SparkFun Mini Inventor’s Kit (SMIK) is a great way to get started with programming and hardware interaction with the Arduino programming language. This mini SIK includes everything you need to complete 8 circuits that will teach you how to blink an LED, read sensors, drive servos, and more. You don’t need any previous programming or electronics experience to use this kit.
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US$21.95
This board will let you take advantage of your power supply to create a benchtop power supply with enough juice to run almost any of your embedded electronics projects.
Delivery within 1-2 weeks
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US$17.95
The Micro OLED Breakout Board breaks out a small monochrome, blue-on-black OLED. It’s “micro”, but it still packs a punch – the OLED display is crisp, and you can fit a deceivingly large amount of graphics on there.
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US$0.95
This is a simple 2x8 male PTH header. This header is that you will find commonly used to interface with a basic 8x2 character LCDs. Each pin has a spacing of 0.1" in between each other.
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US$8.45
This 5 pack of blue 3 Watt aluminum backed PCBs is sure to shed a lot of light on any project you add it to.
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US$8.45
This 5 pack of red 3 Watt aluminum backed PCBs is sure to shed a lot of light on any project you add it to. 
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US$89.95
This kit is a great way to get started with programming and hardware interaction with the Arduino programming language. The SIK includes everything you need to complete 16 circuits that will teach you how to read sensors, display information on an LCD, drive motors, and more. No previous programming or electronics experience required to use this kit.
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US$8.95
This is the Large Solder-able Breadboard. A bare PCB that is the exact size as our full-size breadboard with the same connections to pins and power rails. This board is especially useful for preserving a prototype or experiment you just created on a solderless breadboard by soldering all the pieces in place.
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US$14.95
This equips your Arduino with mass-storage capability, so you can use it for data-logging or other related projects. Communication with microSD cards is achieved over an SPI interface.
Delivery within 1-2 weeks
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US$99.95
This is the perfect box full of goodies to get you started using XBees. Inside this kit you will find two XBee Modules, one XBee Explorer, one Xbee Shield and a set of R3 headers to solder onto the shield. Connect one XBee to the shield and your Arduino, connect the other XBee to the Explorer board and your computer, and you’ll be able to seamlessly pass serial data to and from your Arduino wirelessly!
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US$24.95

Kit Includes: 5x Mini Photocell, 5x 10k Trimpot, 2x Gear Hobby Motor, 2x Generic Servo (Sub-Micro Size), 2x Bag of 25 10kOhm Resistor, 2x Bag of 25 330Ohm Resistor, 5x 30 Pack of Jumper Wires, 10x 1N4148 Diode, 1x Assorted LED (20 Pack) - (5 Red, 5 Blue, 5 Yellow, 5 Green). 1x Simon Buttons (4 Pack) - (1 Red, 1 Blue, 1 Yellow, 1 Green).

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US$27.95
The FTDI SmartBasic is a variation on our classic FTDI Basic board which allows you to connect a second device to the hardware serial port on an Arduino Pro, Pro Mini, or other USB-less board without compromising the ability to bootload code from the Arduino IDE.
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US$5.95
This Power Resistor Kit comes with 5 each of 5 different 10 Watt resistor values including 1, 2, 4, 8, and 16 Ohms. These resistors are capable of dissipating large amounts of power without damaging themselves. This kit is perfect for testing projects that require large amounts of power while only requiring low resistance.
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US$0.75
This is a PCB mount clip to hold a 18650 Lithium Ion Cell battery. Each battery holder is sold in single units, you’ll need two for each battery. These work great for larger, high capacity applications where a drop-in rechargable cell is needed.
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