The listing, Killing Floor steam key - PC has ended.
$9.99 USD
http://store.steampowered.com/app/1250/Killing_Floor/
6-player co-op survival horror at its finest! Free updates, free special events and a ridiculous amount of fun!
* Game contains trading cards
✔ Code will be sent to the winner via Listia messaging system
✔ No Refunds if the game does not work in your country.
✔ No Refunds due to one time use of these codes.
✔ No Refunds due to buyer's remorse.