Overall, nearly eveything can be considered expensive by European standards in Australia. Luckily, salaries are adapted, and even interns can live off their wage.

Have a look at what you can roughly expect to pay here:

Position	Price
Breakfast/Lunch/Dinner	A$10+
Groceries for the week	A$ 70-100
A jug of cheap beer	A$8-10
Rent (per week)	A$220
Bond	Usually 4x rent
Cellular service (including Internet)	A$25