A little tip, since amazon.com.au name listings for these is so busted it isn't funny.

Search the item you want on amazon.com(sign into your account), on the product page look to the right under the add to list/preorder buttons, you'll see a small box with this.

Shipping to Australia?
Pay in AUD and get FREE delivery on eligible international orders over $49 AUD with AU Prime (Membership fee applies)
Buy it on Amazon.com.au
Click on the "Buy it on amazon.com.au" to go to the AU product page.

I have Impactor, Mirage, JetFire, Red Alert, SS 38 Prime preordered on US Amazon, If these get made available on AU amazon, I'll cancel my order and move them over to get the free shipping with my prime sub.