GOG.com has a great promo with Hasbro / Dungeons&Dragons games , including Baldur's Gate 1&2, Planescape: Torment, Neverwinter Nights, Icewind Dale 1&2, Forgotten Realms: Demon Stone, D&D: Dragonshard, and Temple of Elemental Evil.
These games will be available up to 65% off--that means you could pay as little as $3.49 for Baldur's Gate 2 or Icewind Dale.
It will be a stacking promo, meaning that you will receive a 30% discount when buying one game, 33% for two, and finally, up to 65% off when buying all 9 games. If you already own some of the games on GOG.com, these will be added to your stacking discount: if you own 5 games, and want to buy the other 4, you qualify for the biggest discount.
If you don't own any of those fantastic RPGs and want to buy the complete collection it's only $31.41--that's nine of the greatest for half the price of a new PC game.