You can find Rising Storm (http://store.steampowered.com/app/234510/?snr=1_7_15__13), Red Orchestra 2 and the Red Orchestra Franchise pack 75% off on Steam right now.
With transports rolling in, and new battlefields to fight on heading towards the game, now is a great time to head to the front! Picking up the Digital Deluxe editions will also net you some extra goodies in Killing Floor including player characters and the Rising Storm tommy gun!