Was looking for Japanese eSims from eSim DB, and this provider seems to be the cheapest. Reviews seem alright but small number of reviews so be wary. Got a 20 GB eSim for Japan for ~$15.
Code received from their WhatsApp CS rep, mentioned unlimited use till March 20. They have an app too, but haven't tried it.
Edit: Don't forget to change the website to AUD.
Is the website USD or AUD? Apologies hard to see on mobile