as far as I can tell in my state- there is supposed to be online state sales tax that you self report but the counties have not set forth any guidance as to the extra amount that they individually add. So if anything I would think retailers should only be collecting the lesser state amount. Considering it's 2.5% extra that they are adding for the highest county, that can be a significant amount on a nice guitar. And residents of the other counties should not be included in this. I happen to be more diligent as to what they are adding on but I'm sure many don't pay attention and are in fact overpaying on this tax.