Walmart offers the Peg Perego Polaris Sportsman 850 ATV 24-volt Battery-Powered Ride-On in Silver for $511.76. Opt for in-store pickup to avoid the $9.99 shipping charge. That's $37 off list and the lowest price we could find. It features two speeds plus reverse, a 150-lb. capacity, a 7 mph max speed, and a luggage rack.

Update: The price has dropped to $507.96.