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Not sure how much you're expecting for it, but with the current sale you might be disappointed.
CSS = $6.80
Amnesia = $9.99
Killing Floor = $9.99
All of them on sale right now, all of them worth $19.99 regular price.
The HIB 5 is only 1 key if he offer you only Amnesia means he buy it from Steam. Anyway CS:S worth only one of the games (Amnesia or KF) are you kidding?
Choplifter HD
Hacker Evolution Duality
King Arthur: The Role-playing Wargame
Supreme Commander+Supreme Commander: Forged Alliance
HIB 5 (Amnesia, Psychonauts, Superbrothers: Sword & Sworcery EP, Limbo) + Steel Storm: Burning Retribution + Alien Shooter for 1x CS:S?