Delivery is only free to UK addresses. I get a big red "does not post to Australia" notice when I look at that page.
I can easily buy 2 local front deflectors as the sedan shape is identical. And then I'd only need 2 not-so-awkwardly-shaped rear deflectors to that would send fairly easily via standard post, ordered from the UK.
However, the brands available here are different from those sold in the UK, which means it is highly unlikely that I would end up with matching front and rear tint if I did it that way.