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from DX.com

Micro SD Card Storage Memory Board Module for Arduino

Micro SD Card Storage Memory Board Module for Arduino (Works with Official Arduino Boards)

from Instructables.com

Reading RFID Tags with an Arduino

In this project, you'll learn to read an RFID tag using the Innovations reader and an Arduino Duemilanove.

from Outgrow.me

Digispark

Digispark: The micro-sized, Arduino enabled, usb development board - cheap enough to leave in any project! - $21.00