Don't listen to Jake, I'm just a dick.

Where are you?
Classifieds here, or the Hobie forum is a good place to look.
I see them pop up on Craigslist locally once in a while. I usually use "catamaran" to search.
Both of the Hobie dealers near me seem to always have a few around new and used.

You can post an ad in any of those three and possibly get a response.