Any good games below 20$ for the ps3?

I'm looking to add games to my collection for about 20$ or less I like games like Splinter Cell,The last of us,Alan Wake (original),Assassins Creed,Kingdom Hearts 1.5,Infamous,Bioshock,Prototype,Heavy Rain,Tomb Raider (2013),Batman Arkham Asylum,Dishonored,Deus Ex,Catherine,Enslaved odyssey to the west,(ect..) I've played a good amount of games to be honest and that's just a short list lol. Do you guy think that there might be something else I might of not taken a look at?

Also, besides Portal 2 and Dynasty Warriors are there any good offline co-op games avaliable? They seem to be getting hard to find now a days.

Little Big Planet

Uncharted

Disgaea

I just re-bought a PS3 and have almost 20 games amassed that i payed $20 or less for.

Uncharted 1

Uncharted 2

Uncharted 3

Batman Arkham Asylum, Batman Arkham City, and Batman Arkham Origins

L.A. Noire

Elder Scrolls Skyrim

Grand Theft Auto IV

Metal Gear Solid IV

Minecraft

Borderlands 1 and 2

Red Dead Redemption

Deus Ex

Sleeping Dogs

Bioshock

I know a lot you already mentioned, but I would just scan Best Buy, Ebay, and Amazon for games in $20 range on their filters... there is a ton!

Valkyria Chronicles
Lost Planet
Earth Defense Force Insect Armageddon
Time Crisis Razing Storm
Sonic's Ultimate Genesis Collection

Uncharted Dual Pack is $19.99 at Target this week.

Dungeon Siege 3 is a good offline co-op game (also has online co-op) and is $14 used at GS.