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Why would anyone trade it, if they could get the same coupon for free from several places?
Serious sam 3 coupon isn't free though. It's a game worth like 1key on steam trades. Also the game cost is pretty high so I guess people would buy it for themselves.
90% OFF Serious Sam 3: BFE
offers (Less likely I'll be interested in games but I won't be interested in cards at all so don't offer me cards)
Post here. Don't ninja add me. Thanks.