I have no idea about cost, but Sanchez-Casal has taken over Naples Tennis & Bath:
Only two hours across Alligator Alley. We'll be in Naples next week (we're staying across the street at The World Tennis Club), and my wife has commented about taking a day lesson from them. If she does, I may tag along & check the place out.
I have no idea how good the Florida site is, but my understanding is they are real popular in Spain. At least, popular enough for Murray to train there as a junior...