Not all states will honour the "I have no sales tax" concept. In fact I know of only a couple. Washington state is one of them. The ones that don't honour it that I travel through is OK, NM, TX,CO, UT, MO, ID, CA, MD, DC,WV. Those states I've traveled through and tried to buy stuff and they said that they still had to charge the tax. Mayber I just didn't do it right.
WD