Fujifilm Provia 100F - 120 Film - 36 Exposures $15.60 + Delivery
Check Ikigai Camera, for other film stocks.
Standard post is $7.50, express $9.50 and have "Same Day - Melbourne - 10 KM from CBD - 11:30 AM CUT OFF — $25.00 AUD".
Also the cheapest I've seen Portra 400 in 35mm ($16.50) and 120 ($16.00) for a while. It was on a national shortage just over a week ago.
If you've got space in your fridge, you can keep the film for a decent amount of time for future shoots.
Any good store for film cameras/ accessories based in AU?