i went to america once, and while i enjoyed the trip overall, i hated that every single time i bought something i was actually paying 10% more, or 8% more, or fucking 7.5% more or some shit.
the one time -- the one time -- i remembered this was a thing while shopping over there, i googled the sales tax rate for the state i was in, and used my fucking phone calculator to work it out. i had the payment ready down to the cent, dimes and nickels and pennies and all. i was told that this was a museum gift shop, which was obviously tax exempt, and therefore i had wasted my time. at that point, i just gave up, and accepted that whenever i bought something, my $5.78 of items would actually be $6.24 or whatever.
don't bring that shit to australia.