I received an email from GamersGate this morning letting me know that "With the release of a new Pride of Nation DLC, the base game and previous DLC is 75% off" this weekend.
That means someone can purchase the base game and its first three DLCs for a bit less than $5.
Link (http://"http://www.gamersgate.com/games?prio=relevance&q=prideweekend&aff=ggnews")