One of the reasons I prefer to trade my bikes in as here you only pay sales tax on the difference. You also own the plates and whatewer you have paid in registration fees is yours and transfers to the new bike.
If I had to pay for all this stuff I wouldn't trade bikes every year or two, and it's also why I took the EFI Glide that was supposed to be carbureted. The RatKing needed tires and I figured the RatGlide comes with them. LOL.
Sales tax wouldn't apply if the bike were sold out of state. Not familiar w/ Az law, but could easily mean the dealer would need to deliver it out of state. I wouldn't think that would be particularly hard to set up, but the dealer would have to want to sell the bike.