Online sales have been a commonplace part of life for 30 years, and my understanding over that entire period has always been that sales tax is only collected if the seller maintains a presence in the same state as the purchaser; otherwise, if the seller and the purchaser are in different states, no sales tax is collected (although the purchaser may be nevertheless obliged to pay a use tax to the state).
I (PURCHASER, in Michigan) am trying to order something online from a merchant (SELLER) in Arizona who insists that they are required to charge me sales tax at their (SELLER'S) local rate. Can someone confirm whether or not I'm correct in thinking that they are wrong to do so?