There are (6) US dealers listed on the Kora website:
Unfortunately for Americans, Kora got screwed by their North American importer/distributor on a couple different occasions so they have officially withdrawn from the US market. They are very satisfied with their sales in Europe and Asia and therefore don't feel the need to fight their way back into North America.
Having said that, I have become the US Kora service guy, I know the Kora engineers very well, and can get parts and even equipment directly from the factory. If you are interested in a particular model, I can setup a direct buy for you, ready for 120V operation. I do all this out of my love for the marque and not for any real financial gain.