First it is not an original AMG...
Things have been added on...
Then you'd have to ship it to the west coast of the US, so count on minimum US$1000.
Shipping to Sydney would be (including all the paperwork) a minimum of A$3500.
Then you need to remember that it is Left Hand Drive which mean you can't get it registered for another 9 years (must be 30years and older). And before you think about it, you can't do it in the ACT either...