OMGosh, I am equally addicted to that. You can buy/sell/trade pretty much anything, that is legal.
Just put in craigslist.com and you can select your area. We got our coop off of craigslist for $175, it was a steal, we painted it and walaaaaa......... a perfect chicken coop. Check it out.
Its a bulletin board to post things that you might otherwise see in the classifieds or at a garage sale or eBay. Just remember to be careful. It is not monitered, so there are alot of scammers on it as well as great deals.