I am running into this with local suppliers even.
The home-rule cities require a tax license from any vendor selling into their cities. One of the vendors told me there are 84 home-rule cities in Colorado.
It just isn't worth the time or money to maintain and report to 84 cities in addition to the state-collected subdivisions.
One alternative is to have UPS pick it up at their will-call.
UPS is designated under the state law as your company rep and when they pick up they are taking delivery and you pay the tax at the pick-up location.
Sound bizarre and complicated?
Thank your legislators.