The latest Humble Bundle heavily discounts several Rockstar games for charity.
Kicking things off, paying $1 or more will unlock copies of Manhunt, Grand Theft Auto: Vice City, Grand Theft Auto III, and Max Payne. While paying more than the average (currently $9.55) will add Bully: Scholarship Edition, Grand Theft Auto: San Andreas, L.A. Noire, and Max Payne 2: The Fall of Max Payne to the bundle.
Finally, donating $15 or more unlocks everything above, plus Grand Theft Auto IV, Grand Theft Auto: Episodes from Liberty City, Max Payne 3, and the L.A. Noire DLC Bundle.
All money donated to this bundle, including the money that would usually go to the developer, will go to the Rainforest Alliance charity