I buy a lot of used CDS on Amazon marketplace. I have only been screwed twice. Once, was a collectible, the ad said factory shrink wrap. I opened it and got a waft of cig smoke and brown smoke stained pages in the booklet. The seller bought it already wrapped, so he said, he was pretty upset about it so I believed him. I sent him pic of the brown edges and he adjusted the price for me and sent a credit. The other was buying the Jennifier Warnes Cowgirl song on CD for Master Set speaker placement. Seller said it plays fine, but no tracks would rip, it was scratched to hell. It does play (with lots of glitches) in a CDP though, still worth $8 shipped to try. The song is so annoying after 100 plays that few glitches add needed irony. Most of the time the used CDs are fine for ripping with a bit perfect ripper.