In less than a month I have found:
Enough brand new lumber to build my chicken tractor (cost me 2 batches of bread)
Chive starts for my garden from a local gardener (free)
Two 4' fluorescent shoplight fixtures and extra bulbs ($12, the lot).
I have no idea how well they work for selling stuff but if you're looking for something, get your behind over to www.craigslist.com
, find your local craigslist and post an ad! Say that you're looking for free, cheap or barter. It deesn't cost anything to post an ad, so what's to lose?