Graham Cracker Sheets
From what I've been told by a relative, Australia doesn't really have an equivalent of Graham Crackers. Given how rarely you can find them at the import stores, you're best off making your own. I use this recipe at King Arthur Flour.
 I like it because the measurements are adaptable between volumes and weights, so the recipe can work in any country. Any quality brand name of flour will work. It doesn't have to be KAF brand.