I’ve listed my UDC 36er on ebay here http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=230628213942#ht_762wt_1139
It’s the old steel rim type, all details are there. Starting bid is £99.99. It’s sat in my shed while I’ve been working / abroad but really hasn’t done many miles. It’s not as light as the newer versions but it won’t stop you getting a long long way on it!
I don’t check the forums so please ask questions via ebay. Postage to the UK only, collection from London or East Midlands if you prefer.