Divine Divinity:
http://www.larian.com/Site/english/divinity/divinity.html
Got my copy on the Target budget rack for $10. Fantastic game.
BOOYA!!
I bought Beyond Divinity(the sequel) a few years ago on a whim and Divine Divinity came with it. I played BD for about 20 minutes and un-installed. I was just going to bring the game back, but I decided to give DD a shot. It's still installed on my comp and I'm still playing it.