Try the Buy/sell auction forum on these boards. Folks at BYC are usually good homes for them, as they tend to be people who care enough to educate themselves. You can also sell on craigslist, if you're careful. Be sure to state in your ad that you are going to sell them to a good home only. Then insist that the prospects tell you a little about the home your pets will go to before you set up a time to meet with them. I've had very good success with this method.
birdboy, if that doesn't work out, I just posted some tips in the forum for finding good homes on Craigslist. It's a question I've seen before, so I hope it will help. Just check the main duck forum page--it's still near the top, called "Curiosity Cat's 10 steps etc." (Sorry, trying to get kids to bed... will update with link shortly if I remember)
I've been looking EVERYWHERE for 2 muscovies in my area! I'm in Indiana. Probably not a good idea to ship? I'm wanting a pair. And not to eat. We'd like to get eggs for my allergic to everything son. )