It's been a long time since I've checked prices for PS1 games, but here's a couple of titles that should not be expensive and that I've played to death: Project Overkill (Konami). The controls are wierd, but once you get used to it, can be an enjoyable 2D isometric gore fest. Same thing for Loaded. The first Driver was awesome if you like doing burnouts in 70's V8 cars. Twisted Metal 2. Demolition Derby Raw. Tekken 2 and 3 are some of the best Fighting games ever. Metal Gear Solid, Final Doom, Die Hard Trilogy, GTA 2, Blood Omen: Legacy Of Kain, Tenchu Stealth Assassins, Bushido Blade, Mobile Light Force, Sol Divide... Maybe a bit more pricy now: Casltevania SOTN and Chronicles, Metal Slug X, The Raiden Project