Try J. C. Taylor, Condon & Skelly, American Collectors. All have competitive rates.
I've been with all three over the last 4 decades, currently with J. C. Taylor.
J. C. Taylor is the grand daddy of antique and collector car insurance, having been the first to pioneer the coverage. Condon & Skelly and American Collectors came later on in the 70s or 80s and everybody else copied from there.
All three have websites and you can deal direct with them to get quotes and buy coverage.
My 67 Cougar is insured for $11,000 with $300,000 for liability. Total premium about $120 per year.
Stay away from State Farm and other regular insurance companies. They are clueless about collector car insurance.
Keep in mind that the collector car insurance companies do not cover the car on the day you ask for it. You have to submit your application, photos, and money. Coverage could actually take a week or two to attach so make sure you apply at least two to four weeks prior to your current expiration.
For those of you who are new to AZ and/or to collector car insurance, if your car is 1967 and newer and you are in a county that requires emissions testing, you are exempt from emissions if your car is on a collector policy.
I am a retired insurance agent and claims adjuster. If anybody has questions about insurance I'll be happy to help.