It's Rockstar Games Weekend on Valve's Steam gaming service, and that means big savings on some older, popular games for Mac and Windows - savings of up to 82 percent!

Rockstar's Steam games for Mac include Grand Theft Auto III, Grand Theft Auto: San Andreas, Vice City and Max Payne 3. If you game on a PC or on Windows using Boot Camp, there are a bunch of other great titles in the mix too, like L.A. Noire, Grand Theft Auto bundles and Max Payne bundles, Bully: Scholarship Edition, Midnight Clube 2 and Manhunt.

Examples of the savings include Grand Theft Auto: San Andreas for $4.94, 67 percent off its regular price of $14.99, or Max Payne 3 for $6.59, down from $19.99. If you want Grand Theft Auto: The Trilogy (GTA III, San Andreas and Vice City), it's $7.49, 75 percent off the regular price of $29.99.