There are always used Feathercrafts out there; finding them is the difficult part. In years of recession their numbers swell, here are a few links to help you provide a new home to a “previously loved” kayak.
Folding Kayak Adventures out of Colorado: http://www.foldingkayak.com/used.htm
Folding Kayaks.org has a Boats for Sale page (scroll down on the side bar)http://www.foldingkayaks.org/
Craigslist can be a bit of a bother to seach in its entirety but that just means more stuff is out there right?www.craigslist.org/
Wavelength Magazine has a classified page on their forum that is woth surfing http://www.wavelengthmagazine.com/forum/viewforum.php?f=10
This is obviously a North American biased post, anyone with European, Asian or Aussie pages please fire me an email and I’ll update this post.