The only game I've ever bought twice was Red Dead Redemption. I bought it once the week it was released, then had to buy it again after I bought the Undead Nightmare & all other dlc bundle from the PSN store due to a mysterious disc breakage.

I had gone away for a few days & when I got back, I decided to start Undead Nightmare & noticed my disc had quite a large crack in it! (to the point where the disc was nearly split in 2) Both my housemates had been playing the game while I was away & neither would own up to having broke it. So about a month or 2 later I bought a pre owned copy of the which cost €10 less than the game did new! Took me so long to it because all the game shops in Dublin kept selling out of it round of the time Undead Nightmare came out!