They do not accept foreign credit cards -so your Australian credit card will not work and they do not ship to Australia. You would have to look at using one of the ship forwarding companies. And I think by the time they got it and then you paid for it to be shipped to AU - it would cost quite a bit and you may just miss out on the timing as well.
You've read the books and watched all the movies, now Harry Potter fans can visit the magical places from the wizarding world in person. Here's 10 of the best Harry Potter destinations every fan should see.