The development thread (including manual and support disk image) can be found here:
http://www.stardot.org.uk/forums/viewto ... 20#p176865
Some demos (courtesy of simonm) showing off its capabilities can be seen here:
http://www.stardot.org.uk/forums/viewto ... 45#p177181
The price is £52.50 including UK P&P. Overseas posting is usually £5 or so more. The package includes the board, fly lead, support ROM and 28-pin socket.
PM me or leave a reply in this thread if you are interested in buying some. I'll make another batch if there's enough demand

Cheers,
Rob