I'm planning on supporting other xmega boards, sparkfun's, possibly boston android's or stackfoundary's.
I'm also working on a minimal open pcb design. xmega, caps, and headers. No power jack, FTDI chip, or other stuff. If I finish it, you'll be welcome to send it to a fab and get some boards, though you'll need to be willing to do surface mount soldering. Really isn't that hard, sparkfun has great tutorials on how to do this.
Seeedstudio is fairly cheap, you should be able to get 5 boards for $20-$30. xmega is about $9. A few caps less than a buck. Looking at around $15-$20 per board.