Sadly, you can't get the Super Cub in the United States anymore. Honda did sell the Super Cub in the States as the Honda Passport in the 1980's, but has since discontinued the model.
YouTube user 7863348 has uploaded video of a restored Honda Passport.
An entry last year on Autoblog Green suggested Honda bring the Super Cub back to the States, but no word yet if Honda is even considering it.
Source: Wired.com and YouTube