There is no sales tax for items bought between states. However, states differ on their online sales tax rules.
I find it repulsive that online retailers like eBay, etc. were all excited to become tax collectors.
Retailers that charge sales tax and pocket the money can be prosecuted if they are caught. Retail sales are very hard to track/audit. Most retailers will knock off the tax if you pay cash. That should tell you something. Perhaps several somethings.

