The only site that I know of is Craigs list.

http://bham.craigslist.org/bar/

I do think if times get tougher you will see more people bartering.

I myself LOVE bartering. I have some extra bucks (dairy goats) myself that I am willing to barter this year.

Dora Renee' Wilkerson

Here is a link that might be useful: Y-2K hippie

try freecycle.org