75% off Civilization IV games on Steam

If any of you haven't bought what is the awesomeness of Civilization IV, it's now available at a rock-bottom price on Steam after a huge 75% discount. Civ IV and its expansions are now under $5 USD, and Colonization under $10 USD.

Sure Civ V is coming out soon but for those who haven't got into the Civ series at all before, this'll be a good starting point.

Be quick though, it's only for a limited time! :) (i.e. today!)