A new Shoalwater boat generally costs between about 40,000 and 90,000 dollars or more, depending on the model and how it is rigged. Shoalwater builds shallow-water catamaran and flats fishing boats from roughly 19 to 26 feet, and the price depends mostly on size, the outboard engine, and the options you add. A smaller flats model sits toward the lower end, while a larger 23 or 26 foot Shoalwater Cat with a big motor and full rigging runs higher. Used Shoalwater boats cost less and stay in demand among Gulf Coast and Florida anglers. For an exact price, it is best to ask a dealer.