the best place is www.kei-cars.com Chris there is awesome! He came highly recommended, and I was very impressed! I ordered sight un-seen and am so happy!!
Check out the Daihatsu Hijets too. I had a sambar and switched to the Hijet. I drive on-road most all the time. The Hijet is smaller inside, but handles the high speeds quieter (at least between the two I had).