I'm not sure it was here but read a recent thread on this, something like $15,000 to use the top-end float-on-float-off transport. Probably substantially less if you ship the boat in a cargo container. If it can fit the beam and height, you'd need a 40' container. If you don't want to become a freight forwarder your best bet would be to call some shipping companies and see what they'd charge to load and unload it, and ship the container.
AFAIK Oz has some type of exemption on duties for US-made boats right now, but once you add in the cost of a couple of round trips to the US to actually visit boats, survey boats, select boats...I can see another fast $5-10,000 being spent that way too.