They have setup a Foundation to support this device, and they have a lot of information on their website.
You can purchase them from several sources. In the US, two sources are Adafruit and Sparkfun. (see the website for a list of re-sellers worldwide) Both sell the board at about $15, tho you can get a "kit" that includes a USB cable and a battery pack for a couple more bucks. Both sell an edge connector for the cards, but Sparkfun has one that allows for the board to be attacked to a breadboard HERE.
