I'm still trying to understand how it all works in the USA, so please bear with me. What do you mean by "No Sales Tax", then go on to say "Frequently 10% sales tax"?
The sales tax is 6% to the state, and counties can increase it for their own purposes, up to a maximum of 8%. The average is 6.65%. At certain times in summer, school supplies and hurricane supplies are 0%. Grocery items are 0%.