Right now, all games available on Steam are on sale. You can save 10-50% off all titles. The sale ends January 1, 2008. Here are some of the prices of popular titles:

• Counter-Strike: Source - $17.95 (10% off)
  
• The Orange Box - $37.45 (25% off)
  
• Call of Duty 4: Modern Warfare - $44.95 (10% off)
  
• BioShock - $37.45 (25% off)
  
• Day of Defeat: Source - $8.95 (10% off)
  
• id Super Pack - $52.45 (25% off)