Renting timeshares in Florida

Hi. Does anyone know of a good website to locate timeshare rentals (we're looking for a week each in 3 different locations in mid-to-south Florida, on the coast in Oct/Nov). I believe there are many properties available because of the state of the economy but I just haven't been able to get one that gives a comprehensive list of properties with their asking prices (the haggling starts then!).
Many thanks in advance.