I have a large dog crate in Orange County, CA that I'll be getting rid of this summer. It's a plastic kennel, and in decent condition, just pretty dirty. I don't really know what I'd want in exchange - I need a nice harness for my tiny dog. Maybe some vitamins. I don't know.
If nobody seems interested, I'm donating it to my local animal shelter.
If you're in Southern California and think you might want to buy a plastic crate this summer, keep me in mind!