Prices have risen sharply recently due to the dollar's drop against the Euro. Nevertheless, the best current online price I have seen from a U.S. supplier is $649.88 here:
http://www.totalcycling.com (UK), also advertises that price, which means that all three of the aforementioned suppliers sell that wheelset for about the same price. I'd buy it from whomever gives the best shipping rate to Australia.