Good question Darth Aussie but unfortunately one I cannot give answer to at this time. Given the popularity this line has obtained, I'm assuming sooner or later it might receive a wider distribution and therefore Australia could be included.
As for now all I can tell you is that the best place to get any of the kits online, directly from Japan, and with prices not inflated is
WWW.HLJ.COM (Hobby Link Japan).
They are selling the Darth Vader Kit for 9800 JPY which will be as follow:
$80.00 (USD)
$148. 206 Australian (AUD)
$130.090 Canadian (CAD)
53.400 British Pound (GBP))
Clonetrooper sells for about 7800 Yen which will be:
$66.177 (USD)
$117. 960 Australian (AUD)
$103.581 (CAD)
42.502 British Pound (GBP)
They are also pre-selling the upcoming Clone (either red or yellow) for the same (7800)as the regular white variant.
Not that I'm promoting them, nor I suggest anyone for this place to be the only one to get the kits but I have done a good research on Kotobukiya and as far as I have been able to find out, no one is selling them for cheaper.
Americans have a chance to order from HLJ and have them shipped using UPS (United Postal Service) for a special rate of $22.00 This is truly not a bad deal considering most of Ebay sellers and other stores in Asia are charging about $45.00 to ship.
You will definitely find online retailers with much better shipping charges but the price for the product itself can escalate up to $150. 00 for the Clone Trooper alone, so at the end your better off buying it from Hobby Link Japan.
They also offer different rates for customers outside the United States, so as in your case or any other Australian collectors is best to shop around for the most convenient shipping price.
I know my explanation went much further away than your question but I wanted to clear out any doubts other collectors might had had concerning prices and shipping.
Keep your fingers crossed as I'm doing, and let's hope we get to see these kits selling close to home soon. They are indeed very nicely crafted.