These are your best bet for finding both new-in-box (NIB) and used sets from local Australian sellers:
The LEGO Mindstorms EV3 (set 31313) was officially retired in late 2022 and is no longer available through standard retailers like the LEGO Store or Target. To find one in Australia, you will need to look at secondary markets or specialized "retired set" retailers. Secondary Marketplaces where to buy lego mindstorms ev3 in australia
A few Australian-based stores specifically stock retired or vintage sets: LEGO Mindstorms EV3 31313 (Open Box) - Brickville These are your best bet for finding both
: Check local LEGO "Buy/Swap/Sell" groups in your city, which often have better prices than eBay. Specialized Retired LEGO Retailers Specialized Retired LEGO Retailers : Frequently lists the
: Frequently lists the EV3 31313 retail set and the 45544 Education Core Set .
: The gold standard for LEGO collectors; you can filter specifically for Australian sellers to save on shipping.