Segway Distribution via Amazon offers the Segway MiniPro Smart Self Balancing Personal Transporter in Black or White for $599 with free shipping. That's tied with our mention from two weeks ago (although that was for Sam's Club members only) as the best deal we've seen. (It's a current low 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. Deal ends November 27.
Of note, Sam's Club charges the same, if you're a member and would rather purchase there.