Here is the list of tuition fees in Australia Universities for year 2008:

For Engineering courses only (in AUD$)

ANU            22800
Melbourne  27850
Sydney      24720
UNSW        24960
UQ            22750
Monash      25800
Adelaide    20600
UWA          23000
UniSA        19050
Tasmania    16000

Apparently Melbourne is significantly higher than other universities, higher than UNSW for about 15% and higher than the average for about 25%. The cheapest option will be Tasmania. haha