Steam offers downloads of Sid Meier's Civilization V for Windows or Mac for $12.50. That's the lowest price we could find for either system by $17, although we saw it for $2 less two weeks ago.

Steam also offers downloads of Sid Meier's Civilization V Digital Deluxe for Windows or Mac for $15. That's $5 under our July mention and the lowest price we could find by $45. This version includes a bonus Babylon Civilization with leader Nebuchadnezzar II, a copy of the game's soundtrack, behind the scenes at Firaxis video feature, and more. Note, the additional content in the Digital Deluxe Edition is not available for Mac.