You can get real bargains on Ebay. I got a brand new unopened Emulator X package for about
£140 (£205 at DV) - someone seemed to have a source in Creative and was selling a few of
There's a KS4 here: The last one on Ebay sold for £325. 'Buy it now' price
on this one is £449, and the bidding has got to £295 with 1 day to go. http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=38071&item=374939
It takes a bit of faffing to get set up on Ebay,
but once you're running with Ebay and a Paypal account, it's really easy to buy and sell.