Location, Location, Location.
The most inexpensive lots are the dry ones, followed by the ones located at a fresh water canal or lake. The tip of the price range is reserved for the gulf access lots and leks or even river sites. Water is a highly determining factor in our region when it comes to price. The distance of the way out into the river/gulf, potential restrictions like bridges or locks but also the width of the canal and the distance you can look over water including intersecting canals are all facets of determining value.
Looking at the price it also makes a difference if you are looking at a standard size lot of 10,000 sq ft or an oversized lot, whether the shape admits building a standard home or you have to switch over to a custom plan to make it fit and whether the rear exposure is south or north and will decide over how many hours of sun you will have on your pool area.