i was there for 2years and spent 70K (that is what my dad say la, dun know true or not). all borrow from ma n pa cooperation.
as for pay back, ma n pa co-operation has not been chasing so i'm pretty lucky. anyway it is a debt that u will never ever be able to finish paying.

okie back to topic.....
cost of living in australia varies from state to state and amount spend varies from person to person.
generally rent in perth is cheap, brisbane average, melbourne and sydney expensive.
to save money, u can choose to -
a) go to state where rent is cheaper
b) stay in house that is cheaper
c) share room
d) cook simple meals and dun eat out
e) dun fly back during holidays or take cheap flights
f) do part-time (20hours per week if your visa allows)
g) dun cheong, dun smoke pot, dun party, dun treat frens, be very very giam siap
h) do summer course to shorten duration in aus
i) use the school's internet connection/facilities for everything
quite a few of my frens r like dat in uni and they spend a lot less then me. their weekly expenses is something like this:
Rent : 70
transport: 15
Grocery (they dun eat out): 60
phone: 20
eletricity/gas: 20 (cost per person. shared with housemate)
Amt per mth : 800 (estimate)
Expenses per year: AUD10K per year (estimate with cost of books included)
it depends on idividual la. if u r the kind can can be giap then u spend less. if u r the kind tat must die die have macdonalds, chinese resturant then spend more loh.