I've had quite a few over the years, but here are a few that standout:
-bought a stack of CIB PS1 games from a garage sale for $2 each. Included Ogre Battle, Valkyrie Profile, Ehrgiez, FF8, Hexen, and a handful of other games.
-bought an N64 lot at the flea market once that included an ice blue N64, and about 50 games for $50. Included Mario Party 3, Conker, both Banjo games, both Castlevania games, and pretty much all game included were all quality titles.
-used to go to a local used media store that sold all retro games (pre-7th gen) for $3 regardless of title. Found countless scores there over the years before they went out of business. Just to name a few; .Hack Quarentine (x2), Haunting Ground (x4 or 5), Operation Genesis (x2), Skies of Arcadia(both GC and DC versions), Winning Post, Mega Man X4 on Saturn, Saturn Bomberman, and Klonoa.
-found Chrono Trigger, Secret of Mana, and FF3 on SNES all CIB for $100 total.