Holiday Travel is just south of Leesburg. A little older park that isn't really reflected in the rates. The same for Blue Parrot in Lady Lake. Recreation Plantation in Lady Lake may be a good option. A little nicer amenities than some others and an additional 200+ sites being added over the next few months which should open up availability somewhat. There are others in the area, but I'm not personally familiar with them.
Good luck with your search. It's a pretty nice area to spend time.