Arduino Pro Mini 328 - 3.3V/8 MHz : ID 2377 : $11.95 : Adafruit

Adafruit Industries, Unique & fun DIY electronics and kits Arduino Pro Mini 328 - 3.3V/8 MHz : ID 2377 - The Arduino Pro Mini is SparkFun's minimal design approach to Arduino.  It's essentially a 3.3v Arduino that runs an 8 MHz bootloader on a super small, super thin board.  There are no connectors attached - allowing you to add whatever connectors or wire you want without too much trouble.The goal
The Arduino Pro Mini is SparkFun's minimal design approach to Arduino. It's essentially a 3.3v Arduino that runs an 8 MHz bootloader on a super small, super thin board. There are no connectors attached - allowing you to add whatever connectors or wire you want without too much trouble.

Arduino Products Category on Adafruit Industries

Sparkfun Pro Mini 328 - Compatible with Arduino - 3.3V/8MHz - Solarbotics Ltd.

arduino pro mini products for sale

Arduino, Boards Products Category on Adafruit Industries

The Arduino Pro Mini is SparkFun's minimal design approach to Arduino. It's essentially a 3.3v Arduino that runs an 8 MHz bootloader on a super small, super thin board. There are no connectors attached - allowing you to add whatever connectors or wire you want without too much trouble. The goal of the Pro Mini isn't to replace the Arduino so much as bring the cost down for more advanced users.