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The Paradox Workshop is running a live steam sale on their site. Select titles are on sale for 75% off. The titles all come with Steam activation keys.
On sale are:
Crusader Kings II = $10.00
Crusader Kings II: Sword of Islam = $2.50
Darkest Hour = $2.50
Europa Universalis III Chronicles = $7.50 (Cheaper at
Europa Universalis Rome Gold = $2.50
For the Glory: A Europa Universalis Game = $2.50
Hearts of Iron III Collection = $15.00
Hearts of Iron II Complete = $7.50
Sengoku = $2.50
Victoria Complete = $2.50
Victoria II = $5.00