My friend and I are looking for a new, quality PC game that is coop or multiplayer. We have already played Borderlands(felt it was too slow of a game), DOTA 2 (loved ALOT, but got bored after master every character), LoL(hated), l4d2(not enough to do), splinter cell: chaos theory(enjoyed), EYE, Kane and lynch(got bored after first level), Magicka (couldn't run) castle crashers (meh), Earth Defence Force (liked), Payday (couldn't run), Minecraft/terraria, Diablo 2, Day Z, Cry of Fear(enjoyed), TF2(felt they ruined it), SC2(we were bad at), serious sam(enjoyed) and WoW (enjoyed but didn't want to pay $15 a month). We have also played about all source games. He has a poor quality computer that can run about DOTA 2 at best. We're looking for cheap games(~40 dollars max) without monthly subscription payments.
Overall we're looking for a cheap co-op game that can run on low end computers.
one game we were looking at was SWAT 4 but had no idea where to get it