Sparkfun

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US$6.08

This is a simple plastic plate that holds an Arduino (Mega R3 or Uno) and self adhesive breadboard. This version still holds an Arduino and a self-adhesive clear breadboard but we've done away with the plastic clips and now provide screws which give you a more solid and simple connection.

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US$27.93

This is a 5V Arduino running the 16MHz bootloader meant for advanced users that understand the limitations of system voltage. Arduino Pro does not come with connectors populated so that you can solder in any connector or wire with any orientation you need.

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US$16.73

This is a 3.3V Arduino running the 8MHz bootloader meant for users that understand the limitations of system voltage. It's a great board that will get you up and running quickly.

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US$20.93

This is a kit containing all the parts you need to assemble a joystick shield that can sit on top of your Arduino and turn it into a simple controller. Five momentary push buttons (4+ joystick select button) and a two-axis thumb joystick gives your Arduino functionality on the level of old Nintendo controllers. 

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US$25.13

This is a package Joystick Shield Kit that requires assembly all inside a clear clamshell. Five momentary push buttons (4+ joystick select button) and a two-axis thumb joystick gives your Arduino functionality on the level of old Nintendo controllers. 

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US$23.73

This is a 16X2 Character LCD inside a clear clamshell package. This is an add-on to the SparkFun Inventor's Kit (SIK) which gives you the ability to use an LCD as a visual interface for your project.

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US$23.73

This can equip your Arduino with mass-storage capability, so you can use it for data-logging or other related projects. All new microSD shields have a voltage converter chip on-board that converts the Arduino 5V signals to 3.3V signals in accordance with SD specifications.

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US$34.73

This provides a very easy way to start using MOSFETS for your next high current project. This shield allows you to use a computer power supply (or any other power source) to use your Arduino to switch high current. With RFP30N06LE MOSFETS, you can easily control a lot of current directly from your Arduino.

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US$20.93

This is a basic breakout board for the FTDI FT232RL USB to serial to work with official Arduino and cloned 5V Arduino boards.

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US$25.13

This is a FTDI cable converter which allows for a simple way to connect serial (TTL) interface devices to USB. The I/O pins of this FTDI cable are configured to operate at 5V. The FTDI cable is designed around an FT232RQ, which is housed in a USB A connector.

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US$25.13

This is a FTDI cable converter which allows for a simple way to connect serial (TTL) interface devices to USB. but also configured to operate at 5V with 3.3V I/O. The FTDI cable is designed around an FT232RQ, which is housed in a USB A connector.

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US$111.93
This  is a package GPS Shield Kit with EM406 GPS receiver and headers included inside a a clear clamshell. Adding GPS to your Arduino has never been easier. Multiple GPS receivers attach easily to the shield, and with the example sketch, you will be able to locate your exact position within a few meters.
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US$20.93

A great way to build simple capacitive touch interfaces, and now it's even easier to incorporate into your Arduino projects with the touch shield. The touch shield has 9 capacitive touch pads, with headers for the remaining 3 electrode connections. With this shield you can have a total of 12 touch sensitive buttons.

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US$6.93
This is a small PCB that adapts the standard Microchip 6-Pin RJ11 connector to the Olimex 6-Pin .1" Molex Connector.
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US$9.05
This is a breakout board for the very handy 16-Channel Analog/Digital Multiplexer/Demultiplexer CD74HC4067. This chip can be used to connect 16 analog sources (like sensors) to 5 pins on a microcontroller.
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US$15.33
This is a tiny breakout board and the microphone's input can fit flush against the enclosure of your project. The amplifier on the breakout has a gain of 67 and more than meets the bandwidth requirements of the mic.
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