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OK, cool.
If you change your mind, I have:
Guns of Icarus Online Collectors Edition (Gift),
Brutal Legend, Dead Space, Crysis 2: Maximum Edition, Serious Sam 2, Broken Sword: Directors Cut, McPixel, Thomas Was Alone, The Showdown Effect, Bastion and Amnesia: Dark Descent (keys)
keys are around 2.4$ or 1.75 euros at the Steam Market.
Garry's mod is 7,99€ so you save quite a lot, do the math yourselves. :)