Flutter Basic ($20)
Still under development, the Flutter basic is tiny and simple. You get all the features of Flutter in a circuit board with an low-profile integrated antenna, rather than the large antenna shown in the video. Featuring micro USB for power and programming, components on both sides to reduce size, an LED, and a button, as well as plenty of digital and analog I/O.
Flutter Pro ($30)
Prototypes of this board are what is shown in our video. The Flutter Pro adds battery charging, a professional screw mount antenna, an additional button, and more memory for more code.
Check out the Kickstarter Project to back it up and get a Flutter!