Sdona via Amazon offers the Segway MiniPro Smart Self-Balancing Personal Transporter in White or Black for $499 with free shipping. That's $100 under our February mention and the lowest price we've seen. (It's the best deal now by $100.) It features top speeds of 10mph and distance of 14 miles on a full charge. Connect to the app via Bluetooth to get remote control operation, anti-theft alarm, speed control, customizable lights, vehicle diagnostics, and firmware updates.
Note: As a reader found, Fry's offers it in White or Black for the same price.