Dallas, if your boat is going to sit unattended for 3 months, I'd suggest having it hauled. Storage is cheaper and while someone can drive into it, at least it can't sink while on land. And three months sitting still in warm water WILL require a haul and bottom cleaning when you come back in any case.
The cheaper rates are of course in the less competitive areas, i.e. not the Gold Coast, not a resort area. Add some travel time. East or west coast matter to you?