That's an odd size - I think only Michelin makes it, and Michelin is probably the most expensive of the large tire manufacturers.
Try Boulevard Tire and GCR Tire, both of who have several locations in Florida. Also try Sams Club or Costco, if you are a member. They often have good prices on Michelins.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL