This Tax Dispute Could Cost Arizonans Their RockAuto Access - Jalopnik
www.jalopnik.com
It boils down to the state deciding that RockAuto has a physical presence in the state and therefore owes back taxes on its sales, plus penalties.

I went to but some parts for my car from one of my favorite places. Imagine my surprise when I went to checkout and was told they no longer ship to Arizona.