Rocnerd - I would venture to say that there may be more handgun defensive classes in Fla that in almost any other state. Cost varies by the duration of the program, fame of the instructor, and expertise. In my opinion no one should be allowed to carry unless they take at least one of these classes, preferably one with some legal guidance as well.
Search the internet, call the NRA, ask around at area gun shops - you'll get a pretty good idea of what is out there. Some of the more famous are Mas Ayoob's Lethal Force Institute - whatever you think of him, he's a damn good shooter and instructor, and the legal portion of his classes are invaluable, Clint's Thunder Ranch - travel to Oregon but a great experience, and then there's the Colonel - Cooper and his GunSite Ranch in AZ. Expect to pay close to $700.00 or thereabouts for any of these extended classes - 3 days or more.
You will be able to find many one or two day courses for much less but remember you get what you pay for. Just make sure to check out a prospective class/instructor with locals, ask around on the forums, search by name on the net, etc.
The majority of these classes are well worth it and you will have a great time. You'll leave them trying to think of which one you'll end up at next!
