ANZ version, does not work with 20% off voucher, it is still cheaper than anywhere else I could find.
Having played the previous XCOM titles, I strongly recommend you pick up this one.
IGN review : http://au.ign.com/articles/2013/06/03/first-contact-with-the…
My referral link : http://www.greenmangaming.com/?gmgr=xovewamo
The year is 1962. JFK is President and the Cold War has the nation gripped by fear – but a far more powerful and insidious enemy than communism is threatening America. Known only to a select few, a top-secret government unit called The Bureau begins investigating and concealing a series of mysterious attacks by an otherworldly enemy. As special agent William Carter, call the shots, pull the trigger and lead your squad in a gripping third-person tactical shooter set within a high-stakes, covert war to defend humanity. The Bureau’s mission is clear – survive, adapt and overcome the enemy threat to protect the citizens from the truth.
http://www.ozgameshop.com/pc-games/the-bureau-xcom-declassif…
$39.99 (doesnt look like any pre order bonuses though)
The only other place ive seen it cheaper are traders hawking Steamgifts sold via Ukraine or Brazilian Steam Stores :D