I'm a U.S. expat living in Australia.
Here in Sydney I wear/buy Homyped shoes.
I know an Aussie link might not help you but it's:
https://www.homyped.com.au/
I get them on sale either at pharmacies (called chemists here, ha) or at their sale outlet.
I can't afford them full-price but they're quite reasonable at the outlet or on sale at the chemist.
I don't get them online only because they come in such a wide variety of styles & shapes that I have to try them on before buying. A size 9.5 in one Homyped style that hurts me to death in one shoe might feel great in another style.
HomyPed makes diabetic shoes and also inserts. Although the podiatrist I went to several years ago recommended having orthotics individually molded/made.
Good luck!!
"Not all who wander are lost." = Tolkien