USE tax
Some states, like CA and TX, have a USE tax. Eg, if no sales tax is applied to the purchase by the company, then the individual making the purchase must pay a 'use' tax at the same rate as a sales tax. In Texas, the way to pay the 'use' tax is quite antiquated: print off a form, fill it out, attach a check, and mail it in. It is so onerous that I go out of my way to find a company with a presence in TX so I don't have to pay the use tax.
But lots of my friends to out of their way to find a company that doesn't pay the sales tax. Of course, they are all tax dodging Repubicans.