Don't have anything usefull, especially based in Florida. If you know what manufacturer and model boat you are looking for I would run a search for used boats. Like Used Mako's or something. When I was looking into a used Lund, which I just picked up today by the way, I did numerous searches and found countless used Lunds for sale. Now most were up in the great lakes region, because the Lund is a very popular boat up that way.
The other resource might be guides that are based in and around the area your moving to. Do a search for some guides and send some emails. Tell them your moving down, might be interested what's available for fishing, ask about their rates (keep them interested anyway) and then ask about the best bet on used boats. You won't have trouble finding one, there are probably 10 times as many boats in FL as cars. The other possibilty when you get down there is auctions, both bank and gov. With all the boats down there, you could probably get a good buy at an auction.
Well good luck and tight lines.