Long time lurker, first time poster - sumbled across this sim offer this morning.
$100 cashrewards cashback on the optus 365 day exp. 260gb plan which is currently discounted to $260 (from $320) - bringing it to $160/$13.33pcm.
https://www.cashrewards.com.au/store/optus-prepaid-sim
Heads up that if you try and esim it, the website will try and take you to the app, which cashrewards says is ineligible.
No international calls included what a joke