GamersGate has slashed the prices of Jeff Vogel's sensational indie RPGs by 50% meaning that there's rarely been a better time to get involved with this nostalgic yet fresh collection of fantastic titles. Infinity Engine fans will be in their element here.
As an example of the quality on offer, I'd direct you to our 8/10 Avernum: Escape From The Pit review, wherein I stated that "the sensational quality of its writing and world-building results in a thoroughly worthwhile experience." That said, the standout bargain here is probably Avadon: The Black Fortress, which is on sale for a measly £2.98 and deserves your immediate attention.
You'll get both PC and Mac versions.