If you go to Spilsby island which is near Port Lincoln you will see a shack or two on the northern side of the island. A half acre block of land is for sale overlooking the sea for $49,000 AUD ($34,666 USD). With no permanent inhabitants this would be the perfect getaway for the antisocial. Airstrip is available from flightsim.to
https://www.realestate.com.au/property-residential+land-sa-port+lincoln-202508730