I remember reading there was one country (New Zealand maybe?) where the sales tax isn't included in displayed prices usually but retailers also usually tried to make the price + tax equal an even number. So all the prices would be odd numbers, but it'd even out with the tax.
small amount where the tax won't be over a dollar I bring in some spare change.
Yeah that is how it is done here. I don't know if it is a sales tax or a value-added tax, but of course many non-corporate sales simply don't bother with it.