See http://www.ebay.co.uk/sch/i.html?_nkw=qrp+kit .
Occasionally I look on eBay to see what is on offer. Searching for "QRP kits" throws up quite an interesting selection of stuff, much of it only available by eBay and not otherwise advertised. Some of these items are good bargains.
Touch wood, I have never yet had a bad experience on eBay when buying or selling. Mind you, I would be very careful and not spend too much. Some dealers are good (the vast majority) but there are always a few "bad eggs".