It has been a disaster for sim hopping ozbargainers since this new financial year.
Kogan 1c sim is gone
Boost free/profit sim is gone
and I've just found out today Amaysim no longer gives out cashback from CR & SB.
So we've to start hunting for cheap sims again.
Looks like the cheapest sim currently is Lebara (Vodafone network) for $6/30days.
This deal is not in Coles' catalog this week. But it runs frequently between Coles/WW.
Plan Info: https://www.lebara.com.au/
You may use Coles digital gift card to purchase sim cards @ Coles, but you can't use WW's gift card to purchase sim cards @ WW.
Update: As per Neoika's comment, there is a $4 pack, depending on your local store, which gives you 8GB and limited intl calls.
2nd cheapest would be Catch (optus network) $21/90 days, that's equivalent to $7/30 days
https://www.ozbargain.com.au/node/790093
https://catchconnect.com.au/home/left-image/product/63
It also runs frequently. but it doesn't come with free intl minutes, I don't like that.
You may get 3.5% cashback from CR, or I think you may use catch gift card (exchange from Prezzee) to pay for it, although I haven't tried that.
3rd option would be Belong (Telstra network) $45 100GB Starter Pack, that's $24 for 3 months, equivalent to $8/month
https://www.ozbargain.com.au/node/790418
it also doesn't come with free intl minutes
Mate is running a $1/first month promo, but their billing system is a bit funny and the website is like a Year10 student homework.
https://www.ozbargain.com.au/node/781255
I am using my very last Boost profit sim now, just bought a Lebara for August, we will see how it goes next month. :(
If you still have Lyca sims, they are still the best value, and you could continue using them for another 2 months after activation month.
The new financial year has hit them all hard, and my prediction of Boost free cashback sims being cancelled this year seems to have come true.
Heck I only started real sim hoping last financial year.
Good thing at least that during zip boost hacks, I didnt buy $2 sims instead $30 starter kits, (but no other sims I got that could make easy sim porting)
Mate Promo mentioned would certainly do Credit checks (hence may not be worth it for a lot of people)