If you haven't already picked up Batman: Arkham Asylum at one of the many, many times it's been on sale, it's discounted by 66% to $13.60 on Steam--a fine bat-price for a fine bat-game. There's also Grand Theft Auto: San Andreas for only $3.75, which is a must. Our selection of this weekend's bargains crop follows below.

Steam
• Batman: Arkham Aslym Game of the Year Edition - $13.60 (66% off)
• Railworks 2 - $19.99 (50% off)
• Numen: Contest of Heroes - $2.00 (80% off)
Games for Windows
• Grand Theft Auto: San Andreas - $3.75 (75% off)
GamersGate
• Archon Classic - $9.95 (34% off)
• Delve Deeper - 2 for 1: $4.99 (50% off)
• Doom Rails - 2 for 1: $9.95 (50% off)
• Dungeon Defenders pre-order - 4 for 3: $26.97 (25% off)
• Greed - Black Border - 3 Pack: $14.99 (75% off)
• Port Royale 2 - $3.99 (60% off)
• Rig'n'Roll - $17.47 (50% off)
• Street Fighter IV - 2 for 1 Pack: $29.95 (50% off)
• The Scourge Project: Episodes 1 and 2 - $9.95 (50% off)
• Tom Clancy's Splinter Cell Conviction - Buy 2 pay for 1: $29.95 (50% off)
• Unreal Tournament 2004: Editor's Choice Edition - 2 for 1: $9.95 (50% off)
• Unreal Tournament 3 Black - 2 for 1: $19.95 (50% off)
Good Old Games
• Anuman games pack - $35.92 (50% off)
  • Amerzone - The Explorer's Legacy - $6.99 (30% off)
  • Haegemonia Gold Edition - $6.99 (30% off
  • Iron Storm - $6.99 (30% off
  • Megarace 1 + 2 - $4.19 (30% off)
  • Megarace 3 - $4.19 (30% off)
  • Still Life - $6.99 (30% off)
  • Syberia - $6.99 (30% off)
  • Syberia 2 - $6.99 (30% off)
Impulse
• FIFA Soccer 10 - $14.99 (50% off)
• Armada 2526 - $14.99 (50% off)
• Hegemony: Philip of Macedon - $14.99 (50% off)

Did we miss anything? Raise it in the comments to share the cheap game love with your fellow Shackers!