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I could do a Killing Floor key for Bulletstorm if you're interested. I personally got the key when I got my Be Mine 2, although I already had Killing Floor prior.
Sorry, I just thought I'd offer and didn't know if you were looking for just the base game or not. Personally I was just checking to see if you were interested in the key form of the regular Killing Floor since it was around the value of Bulletstorm. If not, I apologize and hope you find someone to work with =). My friend and I already own Bulletstorm, so it was more of a side-grade where I'd basically get a tradeable for an unused key.
I have Killing floor tradeable, if you are interested for bulletstorm, add me
I have
1) Humble Introversion Bundle key including: DEFCON, Darwinia, Multiwinia, Uplink
2) Bulletstorm
And i'm looking for good offers and Killing Floor!!