I used to be able to order from the US BB website, but since BB opened stores in Australia, they cut off access to the US website and stopped shipping to Australia from the US website.
The stock on the "Australian" website (which actually appears to reflect stock held in Hong Kong, strangely) and the actual stock in Australian stores, is frustratingly different. There was a nice, dark blue oxford shirt from the Red Fleece line on the website some time back but the website only had it in "L", whereas I take an "XL" in the Red Fleece line. So I asked at my local store and, after checking their stock, they told me that the shirt wasn't actually in stock in any of the Australian stores - it was only available in limited sizes online.