Vat removed at checkout. Base are good to deal with, but they don't accept Paypal. Most credit cards charge a 3% foreign currency conversion fee, which you'll need to factor in to the price, but still works out cheaper than anywhere else.
A few other decent gaming deals
https://www.base.com/games/pg735/bn10007920/GamesSale.htm
I thought they'd be cheaper than OzGameShop, I just hadn't had a chance to check it out. Well done.