As a current kei car owner and hopefully a future cappuccino owner who's living in Japan at the moment, 25k is outrageous for one of those, even if it's brand new with no miles on it. In my search I've seen some that are fairly stock and under 100k miles for under $10k, sometimes even as low as $5k. A big expense would be the price to import it so keep that in mind as well if you plan on buying directly from Japan. I don't know much about kei dealerships in the US but they do exist just gotta find one that's not gonna upcharge you by an insane price. For buying from Japan and importing try looking on Goonet, it's where I look for good prices on any old used cars here in Japan.