GOG has a sale on (until Friday the 21st): Diamonds of D&D - 9 games for $30. The more games you buy the larger the discount (unselect the cheapest game, and the price goes up by $1). I unselected the 3 game I already have (disk versions) and the total was still pretty much $30.

Baldur's Gate: The Original Saga
Baldur's Gate II: Complete
Icewind Dale Complete
Icewind Dale 2 Complete
Neverwinter Nights: Diamond Edition
Planescape: Torment
Temple of Elemental Evil
Dungeons & Dragons: Dragonshard
Forgotten Realms: Demon Stone