The Freecycle Network is a grassroots and entirely nonprofit movement of people who are giving stuff for free in their own towns. It is a effort to promote waste reduction. There is a separate group for each community that you can join.

Job postings, items and services for sale or trade, housing listings, and discussion forums.

Items for Sale at the Resource Center: The Resource Center is a Chicago-based nonprofit environmental education organization focused on demonstrating innovative techniques for recycling and reusing urban materials.

Links to Bartering organizations.

Referrals on obtaining materials for the arts. Closest sites referred to are in Iowa and Indiana.

Article with advice for artists on how to set a price and claim bartered goods and services. This article is written by an arts business expert. Some of the art-specific examples may be less than contemporary, but the business principles that are discussed are excellent.