I’m in Florida, we use it a lot in marine/air boat sector. I don’t know about Arizona . Wawa has it here, As well as Murphy. There is usually a separate nozzle with a different color label, and not all pumps have it, only a few on the ends of the pump rows. Maybe out there check with agricultural locations ?
Check with members of a car club/ at a show? Marine gas would be an option but here it is more expensive