http://store.steampowered.com/app/1250Just the regular version, not the full pack (those are just skins for your character, they don't add weapons or anything).
I can send it through Steam by email or by adding you as a friend then trading it to you. Does not require a steam account, but you will need to make one if you don't have one with a valid email.
Killing Floor is a fun coop first person shooter.
http://bitmit.net/en/trade/i/916-killing-floor-on-steam/description