Not only that, but even on the same street you could have varying sales tax from the store 100ft down the road because you are on the border of a city/municipality that has their own tax applied.
There really is no good alternative than to just omit tax and have the customer expect 5-7% typically.
Ok.
Some states have higher sales tax also.
NAXALT (not all X are like that) isn't really a useful comment.
It's better to identify differences between the general case and the exceptions, and the reasons for them, than simply to say exceptions exist.