The best way to use this web site it to create an account so that makes it easier for you to repeat visit because your information will be prefilled in the cart and checkout thereafter.
Change the currency converter at top right to your currency. Put what you want in the cart and go to checkout and you will see your information prefilled and the shipping cost in your currency, before going to payment where it will finalise in AUD equivalent.
Your credit card will show the exact amount invoiced in AUD AFTER the amount you have been billed in YOUR currency – which will be the same or a very close approximation to the amount shown on our web site before you went to checkout, as our web site uses live xe.com data to give you the equivalent to our AUD price.