Is it possible to buy in Australia, snack bars that are
- high in protein,
- relatively low in sugar,
- have no artificial sweeteners (sucralose etc)
- have no sugar alcohols (maltitol, xylitol etc)
- relatively inexpensive
Something similar to Rise Bars would be good.
Consider making some yourself? You'll know exactly what's going in there and the cost would be a tiny fraction of the shop stuff, there are heaps of youtube guides available.