Recently I made a spreadsheet with information for every mobile plan and provider in australia I could find. It has data on Plan data caps, price, price/gb/month, speed caps, Rollover / Data banking amounts, and how much texting and calling you can do. I made so people can easily compare prices for mobile plans like you can with NBN plans (see This Spreadsheet for that (not made by me)). I plan to update it occasionally, maybe once every year or 6 months.
You can download it in this repo: https://codeberg.org/libre-net-au/isps