The BundleStern package includes Europa Universalis III and all 11 DLCs. The full price for this Bundle is $40 on Steam, and the cheapest it has been was $10. One reviewer on Steam had clocked in over 1600 hours of gameplay!
They also have 75% off Europa IV and most of it's DLCs: http://www.bundlestars.com/
Note: It comes with 12 keys, and I was researching how to activate lots of Steam keys in one pass. i found this thread: http://gaming.stackexchange.com/questions/107580/bulk-activa…
There is a link for a Windoze program that I found in the Bulk Activation discussion, but it didn't work properly for me despite creating a correctly formatted text file. It would open the Activation dialogue but seemed unable to input the keys:(
http://www.mediafire.com/download/61ilee41is8se5v/SBKA_x86_v1.0.0.12.7z#!
Does the DLC add much value to the game? I believe I already have the game but might get the bundle if the addons are worth it.