You can think of the Sea-Doo Seascooter XL Personal Water Propeller, $199.95, like a magical underwater electric scooter for snorkeling, diving, and having underwater fun. Easily zip around below the surface at 2mph and dive quickly to depths of up to 15 feet. For safety the propeller is safely encased in a tough plastic grille and stops when you let go of the handles. You only get one hour of use after overnight charging but that’s plenty when you think about it. Pick it up at Sharper Image.