$40 SIM Only Plan - Optus having Super Spring Saver down to $30/month for 12 Months.
15GB Data + Unlimited Call & Text + 300 mintues for Standard International Calls & Text + Free streaming of Music and Optus Sport.
First month will be billed pro rata which most likely be the full $40, up to your discretion to argue about it.
Edit: Requires a Credit Check for the contract which requires information about housing and occupation will 100 points of ID.
Edit2: If you can bear with Optus customer service you'll eventually get someone competent enough to understand your situation and get what is required to be done.
Dupe ?