The HumbleBundle has all the Civ 5 up for $15!
I should specifiy it's the base game plus the two major DLCs/expansions.

Still a crazy awesome deal.

II'm a huge Civ fan, so... I grabbed it. (Oh, it also raises money for charity)

xD

~5p1k3

Steam didn't pull any punches with this stuff, did they?
There's even an option for forums!

(Although... we could probably just boot up the ro.twin-x forums)