eBay
Board for programming wave 2 Tamagotchi figures, schematic available here: https://github.com/natashenka/Egg-Shell/tree/master/board/eagle

Use this board to create Tamagotchi games, items and programs!

Also an AVR board, programmable over the header only.

Details on using the board are available here: http://www.kwartzlab.ca/author/natalies/, code is available here  https://github.com/natashenka/Egg-Shell/ 

Windows is recommended, Linux and Mac support are limited (contributions very welcome). Programming is slow on Linux, and the board is not detected on a Mac.

Figure and USB cable are not included. Allow two weeks for delivery in North America and three weeks for delivery internationally.