Thanks for all the suggestions.

Most have serrated blades which I can't sharpen
Freecycle is out - bad experience with a weirdo and I won't list my address
Norman Bates - now there's a thought

I'll probably end up wrapping the blades really good, and either putting them in the trash, or maybe in a Goodwill or Salvation Army bin. They could probably get a few bucks out of them.