best bring in the Disc Doctor
Man, I miss Blockbuster, at least the Mexican version and specifically the one near my parent's place.
They would sell buy used games after they passed a "visual" test by the clerk (as in, they weren't scratched like hell), but allowed you to return them and give it a polishing/buff in one of their machines, if the game still didn't work (they would install it in a 360 console in front of you), you'd either get the money back or get another copy. They even offered the service for free if you bought one or two packs of microwave popcorn in case you had another damaged disc at home, lmao.
Hell, at some point they rented the game you previously bought so you could take that one home, install it, give it back and use the damaged disc to boot the game. I really liked buying stuff from there, good times. That's how I managed to score a copy of Guitar Hero 5 and Splinter Cell Blacklist, which were kinda rare to find over here.