I know this is not a secret but for those who may not know Amaysim offer some plans you can only select after becoming an Amaysim customer which are pretty amazing value. I hadn't seen a post for this so thought I'd make one.
$30 per 90 days (roughly $10/pm)
- Unlimited talk + text
- 4GB data, rolls over indefinitely
- Unlimited talk + text
- No Data
- 12c/min calls
- 12c/SMS
- 5c/MB data
To access these plans I grabbed a $10 prepaid SIM and activated it on the 7-day $10 plan, I believe this is the cheapest entry point. Immediately after I could log in to the Amaysim App or Website and change my plan to any one of the above (or any of the others advertised on their website).
EDIT: The user mayo in the comments below provides a link to sign up to the $0 PAYG plan directly, so you don't need to be an existing customer for that one (you do still need to deposit $10 to get started). The user Phong7 and maybe others also offer advice on how to get on to the $30 plan without sacrificing $10 credit first :-) See the comments. Thanks community!
The reason I came across this was I needed two SIM's for my young sons with a little bit of data. x2 of the $30/90-day plans works out about as cheap as it gets. Happy to debate why I went this over a discounted 365-day SIM from another MVNO in the comments :-)