This should show you search results for the highest rated co-op games on Steam. You may want to use the tag "online co-op" instead if you will be playing online or just check the game and make sure it does what you want, online or local co-op.
http://store.steampowered.com/search/?sort_by=Reviews_DESC&tags=1685&category1=998
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I don't know about price on other sites but I recommend BattleBlock Theater
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Castle Crashers goes for pretty cheap. You can't go wrong with that
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Killing Floor, Killing Floor 2, Saints Row: The Third, Portal, Portal 2, Borderlands 2...
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Hello, i'm looking for a game that's cheaper on websites like G2a so i can buy me and him a copy and send him it, then we play together, know any good co-op games?
Roughly lowered price on g2a or any other websites to like 2£
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