The EU4 collection is part of the Green Man Gaming 75% off sale, combined the additional 20% off code that can be applied makes this game at a nice $20 USD.
Note that this collection includes the base game and DLCs and expansions released until Sept 2014. That means the Art of War, Common Sense and other content released after Sept'14 is not included.
If you would like them, some also seem to be on sale so add it to your cart.
Europa Universalis IV: Art of War - RRP 19.99, Sale 6.79 >> 20% off = $5.432USD ~ $7.11AUD
Europa Universalis IV: Common Sense - RRP 19.99, Sale 6.79 >> 20% off = $5.432USD ~ $7.11AUD
Remember to also use Cashrewards!
Information about EU4 Collection copied from the store page:
The Europa Universalis IV collection expands on the unparalleled freedom, depth and historical accuracy of the base game with an updated pack which includes all DLC up until July 2014.
This collection contains:
Europa Universalis IV
Europa Universalis IV: 100 Years War Unit Pack
Europa Universalis IV: Winged Hussars Unit Pack
Europa Universalis IV: American Dream DLC
Europa Universalis IV: Purple Phoenix
Europa Universalis IV: National Monuments
Europa Universalis IV: Conquest of Paradise
Europa Universalis IV: Res Publica
Europa Universalis IV: Horsemen of the Crescent Unit Pack
Europa Universalis IV: Star and Crescent DLC
Europa Universalis IV: Women in History
Europa Universalis IV: Conquest of Constantinople Music Pack
Europa Universalis IV: National Monuments II
Europa Universalis IV: Conquistadors Unit pack
Europa Universalis IV:Native Americans Unit Pack
Europa Universalis IV: Songs of the New World
Europa Universalis IV: Native Americans II Unit Pack
Europa Universalis IV: Colonial British and French Unit Pack
Europa Universalis IV: Muslim Advisor Portraits
Europa Universalis IV: Wealth of Nations
Europa Universalis IV: Muslim Ships Unit Pack
Europa Universalis IV: Trade Nations Unit Pack
Europa Universalis IV: Indian Subcontinent Unit Pack
Europa Universalis IV: Indian Ships Unit Pack
Europa Universalis IV: Republican Music Pack