Found this at Officeworks and I think it is good value to try Boost Mobile network. Not sure end date.
From Officeworks website:
$30 sim pack for $10 comes with 20 GB of data as well as unlimited calls and text for you to use within Australia in 28 days.
From Boost mobile website:
20GB + 20GB bonus data on your first 3 recharges when you activate by 5 July 2021. First recharge by 5 July 2021, remaining two recharges by 31 August 2021. Terms Apply.
Link to Boost $40 Prepaid SIM for $20 at Officeworks https://www.officeworks.com.au/shop/officeworks/p/boost-40-p...