Just received an email from Base.com about their summer sale, and thought I'd share what looked like the best deal of the bunch.
The price in the title is the price of the game with the VAT removed and shipping fee added. On the product page, select the Other buying options tab and choose Base.com instead of BaseCH as the seller - this will remove VAT from the final price during checkout once you enter an Australian shipping destination.
This seems to be the cheapest price the game is currently available for (the next best I think is Big W at $45). I expect this game will drop in price fairly quickly, as Bethesda published games often do, but if you feel like playing it now, I think it's a good deal.
Unfortunately for Xbox One owners, it looks like this price is only for the PS4 version.
Cool