Mad Max is a given, George. I'd add the following, though viewed years ago: The Road Warrior, Death Warmed Up, Romper Stomper, Metalskin, Puberty Blues, Thirst, Longest Weekend, Harlequin, Dead Kids*, Strange Invaders, Death Camp Thatcher, The Quest, The Last Wave, Where The Green Ants Dream**, Temptation of a Monk***, Starstruck, Sweetie, and Body Melt.
*Shot in New Zealand, but financed with Aussie cash, Aussie actors in the mix, Aussie director and writer, and producers too.
**German financed and directed
***Aussie financing and shot in Australia, though the entire film is in Mandarin and stars actors from China and Hong Kong and Taiwan