Was shopping for a decently priced data SIM when I found this deal going on on Optus.
150GB/mo for 50AUD/mo for the first 36 months but without a minimum term contract. In other words: double data, without contract lock-in.
While the cost per GB is not as cheap as the 500GB Optus One deal going on atm, the terms cover mobile broadband usage (unlike the voice plans that explicitly exclude those), which may be attractive to some (it is to me, as I don't want to run afoul with Optus' FUP).
It is one of their promotions since early this year. Personally, I think the 50G for $25 is much better. I just finished my 200G for $49 contract and switched to the 50G plan. Could barely use 20G each month before the Covid and now only less than 2G since we stay at home most of the time.