I read good things about the Callaway pre-owned site. I ordered a "like new" Paradym 7 wood from them and it came still in the shrink wrap with stickers/tags on the shaft like it was never used. Not a single mark on the head, no scuff marks at all. 99% sure it was a brand new club.
They also offer a 15 day money back guarantee if you are unhappy with the condition. You can just print up the return label from UPS and send it back. It also has a manufacturer warranty good for a year I believe.
One very small downside is it comes with a generic "Paradym" head cover. So if you order a driver and a few fairway woods they all look the same. But you could come up with something fairly easy to help identify which club is which.