I'm with EzySim for my cheap annual plan. I change provider most years but it's normally around $110. I've used Aldi, Kogan and Coles in the past. Be sure to turn off the auto-renew.
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Check Aldi prepaid(edit: looks pricier than I remember).
If you need country/remote coverage, Boost prepaid yearly. About $300 though.
Compare here:
https://www.finder.com.au/mobile-plans
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