In Australia it's illegal not to have the actual price customer will pay at the checkout, GST and any other fees and charges have to be inlcuded in the advertised price. Luckily we only have a single Federal tax called the GST, states do not levy sales taxes.
This way, the government can sneak in tax increases with many uninformed public being none the wiser. Despite my earlier joke, I like to know how much of what I’m paying is supporting the government vs what’s going to the business owner. In the US, we bury gas taxes in the price paid at the pump too. I’d like to see taxes delineated clearly.