Walmart has the Disney Princess Mercedes 12-Volt Battery Powered Ride-On for only $199 Shipped! (Reg. $350) This price is good for the pink option only. Your little one will love driving in luxury in this Disney 12-Volt Mercedes Ride-On convertible. Going speeds of 2.5 MPH in forward or reverse, with a maximum speed of 5 MPH, this ride-on carries a driver and a passenger. Real doors open and close, with authentic graphics really make this convertible stand out.