I hope it's allowed to post links to auction sites here. If not, moderators please scrub this post. There is currently one box up for auction on "ePay" http://cgi.ebay.com/ACORN-ARCHIMEDES...QQcmdZViewItem
Good chance to buy one as those computers are usually cheap. Disadvantage of that auction: no mouse included. The Acorn needs a dedicated mouse as the protocol is different, so Amiga and Atari ones won't work.