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Cheapest. So most likely GoG. I would like to know the prices on both though, if that's alright.
I can do GOG for $20 (you pay the fees).
Steam version I wouldnt go less than $50 for. Its a hard find at a cheap price.
As for your other games: Rocket League $16, Axiom Verge $16. You can get much better deals than what I can offer for Talos.
My paypal is verified, do not add me, I'll add you. I fucked up and put up a giveaway for Gauntlet only to find out my 3 copies are restricted to Turkey... for some reason. So, I need some quick copies for my winners!