I reccently posted about the "Solowheel" one-wheeled vehicle. It has a range of about ten miles (hey they are Americans and haven't quite caught up with everyone else and gone metric) - and I can buy one locally for . . . . . about $2,500 Au.
Google search that name and you will see a number of Chinese made knockoffs at about $450.
Folks, I know what goes into the Solowheel and it ain't rocket science: you could probably buy most of the parts for one for about $150 bucks and cobble your own together if you were really keen . . . . . but just think, look at what it is: motor, batteries and a single wheel and tyre , and a board of electronics that has accelerometers and gyros on it - hardly worth two and a half big ones. If the Company really want to sell it they better do something about that price, it's crazy.
Now ignore that, and consider the point of the thing: personally I would rather walk since I consider it the best exercise for humans, especially over such a relatively short ranges, it is too small to carry shopping and with a full backpack you might exceed it's load limit . . . . . almost as good as a segway.
Anybody seen Dean Kamen lately? I thought not.