Time to make sure your checking account or credit card can take another hit. The Steam download service has yet another list of games that it's marking down in price for just one day only. Get on the ball with these deals, many of which are 75 percent off their normal prices. The deals end at 1 pm Eastern time on Wednesday:

• Osmos (PC/Mac title) - $2.49
• X-Com Complete Pack (Five games) - $3.74
• Commandos Collection (Four games) - $3.75
• Grand Theft Auto IV - $4.99
• Team Fortress 2 - $6.49
• Numen: Contest of Heroes - $7.49
• Street Fighter IV - $9.99
• ArmA II - $19.99