Buying out of state demo

Has anyone been successful buying a demo out of state and getting it registered in your state of residence? I’m based in California, looking to pick up a demo and seeing the specs I want in neighboring states, but not here. I called an Arizona Tesla to ask if it would be possible to pick up a demo they have on the ground, obtain a “drive out” 90 day permit and register in California. They’re saying this is not possible. From what I can tell from the Arizona DOV website, this 90-day non resident drive out permit is designed exactly for this purpose, allowing out of state residents to purchase a vehicle in AZ and then bringing it back to register in their state of residence.