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1 game from here: http://www.steamtrades.com/trade/cJ9Ob/h-bundle-gamesnormal-games-w-1-tf2-key-for-each-2-games-of-your-choice
Maybe for 3 Puddle trading cards and 1 Super Meat Boy trading card (1/6 of 1.62€ value. You know 6 refs=1 Tf2 key ;) )