Steam, the highly acclaimed digital distribution, DRM, multiplayer and communications platform developed by the Valve Corporation is having a rather impressive sale until January that I'd be remiss in not informing you of.
It's also worth noting that today's "daily deals" [about 18 hours remaining at time of post] include the Obsidian's D&D RPG Neverwinter Nights 2 [including both expansions] for €9.99/$9.99 [regularly €19.99/$19.99] and the original Star Wars: Knights of the Old Republic [$2.50/€2.50] which introduced gamers to The Old Republic era of the Expanded Universe Star Wars continuity which is due to be revisited in 2011 with Bioware's First MMO Star Wars: The Old Republic.
NWN2 is new to Steam but I ran it glitch free on a Core 2 Quad under Vista 32 and a GeForce 8800GTS a couple of years back, so I'd not anticipate many compatibility issues with today's hardware. KOTOR on the other hand is about 7 years old at this point and like many games native to older Windows versions; may require a fair amount of tweaking for it to run smoothly on today's systems. This is a good resource to aid you if you run into issues.
Thanks to The Whitehouse for the heads up.