The test will cost (as i remember last year) about 11,000 AU$ which equals about 9,900 US$ or 7,820 Euro.
The preliminary exam will cost about 3,050 Au$ (2,750 Us$, 2,170Euro) and the Final exam (The practical exam) about 7600 Au$(6,830 Us$, 5,400 Euro) and about 1,000 Au$ as payment for registration.
You shouldn't forget the cost of flight, staying there, and other stuffs so you need to have around 15,000-20,000 Au$ to be able to do the exam.
Here are a chart about the detailed cost in Au$
The Preliminary exam can be done in your own country (in the Australian Embassy in your country or a near country) but the final exam should be done in Australia.