Development Boards

US$27.22
With this shield you can configure your Arduino as a simple web server or let it get data from the worldwide web. Features include: based on a Microchip ENC28J60 chip, downloadable sample sketches and library, stackable design: the shield can be stacked with other shields.
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US$15.75
The new IO Expansion Shield V7.1 not only heritages the advantages, but also enjoys numerous new features: Compatible with the new Arduino Due, 3.3V/5V operating voltage select, Switch for wireless communtcation & programme, More Easily recognitive interfaces, Colorful header for illustrating digital or analog pins, Immersion gold surface.
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US$22.33

This is a new version of the FTDI breakout board features an Atmega8U2 programmed as a USB-to-serial converter, the same chip found on the Arduino Uno. The 8U2 firmware uses the standard USB COM drivers, and no external driver is needed. However, on Windows, a .inf file is required. 

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US$37.25
The cheapDuino integrates a ATmega8 microcontroller as Arduino NG. So it's available to program it directly with Arduino IDE via the FTDI programmer or USB Serial Light Adapter.
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US$4.98
This enclosure is sized for a BeagleBone Black board with cut-outs for port and header pin access. Features: Durable ABS plastic. Includes self-tapping screws, adhesive rubber feet and instruction sheet. Removable end panels.
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US$8.95 US$4.98
This enclosure is sized for a BeagleBone Black board with cut-outs for port and header pin access. Features: Durable ABS plastic. Includes self-tapping screws, adhesive rubber feet and instruction sheet. Removable end panels. 
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US$23.73
The LCD Button Shield V2 attaches to your Arduino to provide a 16x2, black character, green back light LCD with a keypad consisting of 5 keys — select, up, right, down and left. With this shield you will be able to move through menus and make selections straight from one board attached to your Arduino without requiring a massive tower of shields.
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US$22.33
This shield allows an Arduino board to communicate wirelessly using Bee compatible modules (like Zigbee or BlueTooth Bee). It is designed to be used with Xbee module from MaxStream. It can be used as a Serial Port / USB replacement. It is used to connect two Arduino using Zigbee / Bluetooth Bee or connect a Arduino with PC Wirelessly. 
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US$35.95 US$34.65
This is a multifunctional Arduino/Arduino Mega/pcDuino compatible resistive touch screen. It can be used as display device or sketch pad. With a SD card module integrated also on this shield, this shield has great room for other expansions to your project.
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US$15.32
Solder together a limitless range of circuits and reuse it in all your Arduino projects. A standard 0.1" prototyping grid accepts commonly used through-hole parts and chips.
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US$8.51
The TXB0104 is a 4-bit bidirectional voltage-level translator with automatic direction sensing. This 4-bit noninverting translator uses two separate configurable power-supply rails. The A port is designed to track VCCA.
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US$8.67
For when you want better audio for music playback, a USB audio card can greatly improve the sound quality and volume. We like this particular dongle for not being too bulky, you can plug it in without blocking the secondary USB port.
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US$254.75

Learn Robotics, Electronics and Programming with comprehensive step-by-step lessons by using the popular Arduino as the brains behind the best selling Boe-Bot Robotics Kit by Parallax. Make your Arduino the onboard brain of a mobile robot and learn robotics, electronics, and programming with this versatile kit and its accompanying step-by-step lessons. The Board of Education Shield plugs into your Arduino (Arduino UNO included) and mounts on the popular Boe-Bot robot chassis.

Delivery within 2-3 weeks
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US$13.92
It's a tiny microcontroller board, built around the Atmel ATtiny85, a little chip with a lot of power. They wanted to design a microcontroller board that was small enough to fit into any project, and low cost enough to use without hesitation.
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US$16.97
Love FLORA but want a bite-sized version? Look no further, GEMMA is a tiny wearable platform board with a lot of might in a 1" diameter package. Powered by a Attiny85 and programmable with an Arduino IDE over USB, you'll be able to realize any wearable project!
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