Orlando may be the best bet, and it's close. Get ready to say Hi to the traffic out that way.
There was a guy at the huge indoor/outdoor Daytona Flea Market (Daytona Beach is right down the road) by the NASCAR track who had a LOT of great old cameras, but that was years ago. Downtown on the mainland, there's antique shops and indoor flea markets, those are always a good place for old cameras. Still, the big flea market is a good place to check, and it goes on 7 days a week.
You're probably closer to D.B. than Tampa/St Pete, but either way it's under 2 hrs. Which is cool, because you get to see the difference between the 2 coasts of Fl. Very different from each other.
Ocala