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It's a retail copy, I bought 3 not to long ago. 1 for myself and 2 to trade away, one was already traded successfully on this board.
To clear things up further: Steam ran out of keys for Prey at some point. The developers never resupplied steam with further keys, so Steam took prey out of their catalog. The only way to get it is to find a retail copy, all the keys in the retail copys are redeemable on steam.
GTA III + GTA: San Andreas (both on GamersGate) + Sanctum: Violator? I can add one IndieGala, if You want, cause I but a few for 2$ each yesterday ;p This all for Prey + Hydrophobia
[Have]
-Cthulhu Saves the World & Breath of Death VII Double Pack (Steam Gift)
-Hydrophobia: Prophecy (Steam Gift)
[Want]
-An reasonable offer
Steam ID: http://steamcommunity.com/id/4bidden1/