Arduino Home Page

http://www.arduino.cc/

Arduino Suppliers

This ebay dealer, listed in Hong Kong, has a 100% rating, very reasonable prices and the lowest mailing / shipping costs I could find.

Advertised, the Arduino Duemilanive 2009 AVR ATmega168-20PU, is more suitable for beginners. This unit is now less expensive and still compatible with the Motor Shield used in the Tracker design. With on board USB, the Duemilanove circumvents the need for USB to Serial adapters, and other work, required, if using an Arduino Pro, for example.

I found this site useful for viewing a wide range of products.

The Arduino Pro, (two versions 3.3v and 5v) among other Arduino bits and piecies, may be suitable for a permanent installation. There is no on board USB and therefore requires a USB – Serial adapter, external to the board, and an FDTI cable.