Earlier quoted context omitted.
>if I'm in the same state. And that happens what, 8% of the time? Most online services are evading sales tax.
Hell, if you're in Washington, Amazon will ship from an out-of-state warehouse so that you still don't have to pay.
It doesn't matter where the shipment is from; if the business has a point-of-presence in the shipped-to state, they charge you sales tax for that state. For instance, I bought some stuff at the Pendleton store in Portland, Oregon, and had it shipped home to Illinois, and the clerk (very apologetically) told me that he'd have to charge me sales tax since Pendleton owned stores in Illinois. This despite the fact that I was physically in Oregon, the sale was taking place in Oregon, the blankets were still in Oregon, and Oregon has no sales tax at all.