Valve offers downloads of Sid Meier's Civilization 4 for Windows and Mac for $4.99. That's tied with our December mention and the lowest price we could find for a physical copy of the game by $3. Deal expires June 10 at 1 pm ET.

Of note, Valve also offers downloads of Sid Meier's Civilzation 4: The Complete Edition for Windows and Mac for $7.49. That's $1 under our February mention and $19 under the best we could find for a physical copy. Deal expires June 10 at 1 pm ET.