Keith, is it safe to assume that all film available in Australia is imported? How does the markup on imported film compare with the markup on other imported items? Are there competing importers and distributors, or does one outfit have a monopoly?
The USD is selling for about 1.20 AUD, so there's more going on that just the currency conversion. I've noticed that American products in Britain often seem to be priced thusly: First, convert price directly to pounds. I.e., if it sells for $100 in the U.S., mark it at £100. Then add on whatever mythical markup you think you can get away with.