Call RM Classic Autos in Chatham, Ontario. They are the largest classic car auctioneers in North America. The prices are absolutely outrageous but the quality of the cars is non-pareil.
They have an auction in Florida each year and one in Toronto. They also cars on hand in their showroom.
You can also call Kruse Auctioneers in Auburn, Illinois. They also handle the good stuff.
Both of these places generally handle automobiles in the $50,000 U.S. and up category. No clunkers here. The models range from 1950's Jaguars through to Duesenbergs, Cords and Auburns. The high end is in the millions.