BuyDig offers the Razor MX500 Dirt Rocket Electric Motocross Bike for $449.99. Coupon code "SPEED" cuts it to $279.99. With free shipping, that's $20 under our mention from last month and that's the lowest price we could find by $148. It requires eight hours to fully charge and features a 500-watt motor, speeds up to 17 mph, and a 175-lb. capacity.