Since in you're in Australia, check out HPLC (high protein, low carb) bars by Aussie Bodies. At 380 calories with 45g of protein and around 18g of carbs, they're practically a meal. Don't quote me on those numbers, but they're around the mark. They taste brilliant too - better than any of the Musashi crap available. You can buy them in any 7-11 if you're on the run, and of course from all health food stores etc...