[slackenerny]

$100 in parts, according to this guy: http://vicacopter.com

I tried (unsuccessfully) to make his design a year ago and it was more like $300 though, and that assuming you have the RF equipment.

Guy works at NASA I think. The claim that his is the only fully open source autopilot is to my knowledge true. No docs or schematics though, but these could be adapted from other projects, http://mikrokopter.de http://diydrones.com

[HeyLaughingBoy]

What about the Rotomotion guys? I thought their stuff was also released as OSS.