Guy just look around there are tons of Bioshock Infinite keys for $15-20 from AMD Reloaded bundle.
Just check steamtrades lots of people selling AMD Reloaded Keys for dirt cheap.
I have Sealed in the Box:
Call of Duty Black OPS 2 (ROW) includes Bonus Map Nuketown 2025
This is Region Free Version North American Box.
Want $45 PayPal for it.
Will open the box upon receiving the money and will give you virgin key to be registered on Steam.