If you haven't discovered Callaway Preowned, you're missing a great opportunity. They are a part of the Callaway golf club company and as such have a reputation to protect. That's clear from their guarantees and customer service they provide.
Their website is
Used Golf Clubs, Pre-Owned Drivers, Irons, Putters, Wedges: Callaway Golf Pre-Owned
If you feel uncomfortable shopping and buying from them online, call their "store" in Dallas and speak with Dan Harris at 888-722-1315. He's a terrific rep and will take care of your every need.
I'd suggest you visit their website first. They classify all their used clubs in to about five categories of wear. I have shopped with them often and find their classification very accurate. Even if you are not satisfied, they'll replace or refund the club(s) you purchase, no questions asked.