I know you're looking for something second-hand, but I'd still recommend considering the CyBook from www.whsmith.co.uk
They are a bit back-ordered though.
Originally Posted by UKJames
Hi - I'm looking for my first reader, and having poked around the forums for far too long, it seemed sensible to ask here if anyone had one for sale they're willing to ship over here! I'm probably after a Sony, as they seem to be the cheapest, but the Iliad is pretty tempting too - but let me know what you have! My flatmate's lusting after a PRS-505, and can afford a 500, so I may be after a couple...