Stealth Electric Outboards Finally! A powerful all electric outboard that will plane your boat!. However the boat was never put into production and instead the decision was taken to develop the slightly more advanced Sealion ll. Unmasking The Columbia River's Mysterious Stealth Boats. Boat Trader currently has 8 Bay Stealth boats for sale, including 1 new vessels and 7 used boats listed by both individuals and professional boat dealers mainly in United States.