I recently scored a sweet deal on EBay for a XXIO Prime X 5 Wood. In near-new condition, but, no cover. I sent a message to XXIO asking if I could purchase a new/used head cover, explaining I got the club used. Their response was to send me a new one free. (All three seem to be the same company/distributor, which is fine.)
Last year, I managed to break my used, 3 Wood shaft, when installing grips. They simply asked that I ship it to them. Two weeks later I got a re-shafted club free of charge.