Demon's Souls and Dark souls are both 14.99 at New Egg.
Actually, go to Newegg, load up their Ps3 games section and order by least expensive first. whole slew of great games under 20 bucks. --- I use Gamefaqs as a toilet to crap out as much hate and venom as possible so I can be happy and nice in everything else I do. sorry Gamefaqs =/
If you haven't played them, Heavy Rain and the Metal Gear Solid series should both be cheap. Completely different games, but definitely some of the best games out there. If rpg's are your thing, the majority of the final fantasy games 1-10 are must plays (maybe not ff1-5 as much but 6-10 everyone should play).
Heavy Rain Uncharted 1, 2, or 3 Red Dead Redemption 3d Dot Game Heroes Little Big Planet 2 Arkham Asylum Metal Gear Solid 4
This gamer knows what he's talking about!
I would add Mass Effect 2 and Heavenly Sword and Castlevania: Lords of Shadow. --- Favorite 2012 Games: Sleeping Dogs, Mass Effect 3, Max Payne 3, DOA5, Hitman Gamercard: http://ps3heroes.com/hero/Carib2g
Clicked on topic to mention these 2. If you have a 360 get Bayonetta on that but if not you can't go wrong with the PS3 version. --- What is faith then but persistent hope in the face of relentless doubt. Now Playing: Zone of the Enders HD Collection, Hell Yeah!, Final Fantasy 9, Diablo 3