I take no credit for this, but emilyjem from bricksdownunder.com spotted the PotC sets on barnesandnoble.com and did the maths on placing an order. From what I know, this is the only site Australians can order lego from and get US prices. I placed my order the other day and for the entire PotC range, it cost ~AUD$315 rather than AUD$685 if I purchase it at full price. 3 day express shipping cost me USD$107 but that included 2x StarWars alarm clocks which we can't even get in Australia and a couple of Harry Potter sets.
To summarise thats a 40% saving on new release sets including the total $107 shipping costs. http://www.bricksdownunder.com/2011/04/potc-bargains-if-you-buy-u-s-a/