Funny Coop Games here.

I have:

-Castle Crashers

-Trine 2 - Complete History

-Monaco

-Risk Of Rain

-Magicka

Well... Feel free to make an offer, my friend. Compare the prices of the games, let's be fair here (World needs fairness :P. Reasonable offers, please ;).

Games I would aprecciate:

Mortal Kombat 9 (The last one out, from 2011)
Battleblock Theater
Broforce
Goat Simulator
Torchlight II
Killing Floor
Counter-Strike: Source
Counter-Strike: GO (Not my taste but I would try :P)
Ibb & Obb

... But feel free to make any offer of your wish. Depending on the game, I can trade both of mine for one of yours.

Some of those above I already have, but I have a special friend who I like to gift.
Sorry for some bad english. Cheers. See you ;)