Steam offers 50% to 75% off downloads of Killing Floor for Windows or Mac, along with select DLC packs, as listed below. With content starting at 99 cents, each is at the lowest price we've seen. Sale ends December 12 at 1 pm ET. The deals:

• Killing Floor: Steampunk Character Pack for PC or Mac for 99 cents
• Killing Floor: London's Finest Character Pack for PC or Mac for 99 cents
• Killing Floor: PostMortem Character Pack for PC or Mac for 99 cents
• Killing Floor: Nightfall Character Pack for PC or Mac for 99 cents
• Killing Floor: Outbreak Character Pack for PC or Mac for 99 cents
• Killing Floor for PC or Mac (pictured) for $4.99
• Killing Floor Bundle for PC or Mac for $7.98

Also, this weekend only, Steam offers free online play of Killing Floor for Windows or Mac. Offer ends December 11 at 4 pm ET.