Currently 'out of stock', so therefore a backorder/preorder and will ship when stock becomes available.
Not sure how long this is going to last, as from past GTX1080 listings, even the 'Temporarily out of stock. Order now and we'll deliver when available' page will disappear after a few hours as Amazon is hammered with pre-orders.
Hmm, comes up to 616.38 for me.
Order Summary
Items: AUD 605.12
Shipping & handling: AUD 11.26
Total before tax: AUD 616.38
Estimated tax to be collected: AUD 0.00
Order total: AUD 616.38