Killing Floor 1 is on sale - 75 % off DLC Included And Free Weekend

http://store.steampowered.com/app/1250/

The game, and all DLC (even individual) is currently 75% off! If you are missing something from your collection or hope to bring a friend in and up to speed before Killing Floor 2, now is the time!

On top of that, Killing Floor is also having a free weekend, so you (or your friends) can try before you buy!