Vocabulary Question

["Kelly, Katie" <kkelly@spss.com>]

Totally not even close to autocross related, except that they'd be handy at
autocrosses.

What's that vehicle called that's like a skateboard in that stand on it with
one leg you propel by pushing off the ground with the other, but it has two
wheels, and handlebars with which you can steer?

Someone (from another country) was asking me for the English word for this,
and for the life of me, I can't think of what it is! And do you know where
you could get one?

Thanks!

Katie