I've never seen them sold locally. I did do some searching and what I did find was a lot of discussion and reviews most of which seemed to lean toward "it's a great pump, but totally not worth the money compared to other options". Marine depot carried them for about a week then dropped the whole line.
Are you absolutely set on that pump? I'm guessing that lack of vendors might be for a reason. Klauss makes great stuff, but the price of the pumps after being floated over from Germany might be outweighing the high quality for most people?