Want any easy way to buy or sell construction material? Operating much like a Craigslist for builders, the new site exchangebucket.com matches sellers and buyers. A free service, exchangebucket.com started in Northern California but has aspirations to grow across the US.
New and used materials can be found on the site and there's forum that connects professionals, homeowners and do-it-yourselfers.
Unfortunately I can't find any materials in my area (Vermont) as the site is not well enough known, yet. I'll be checking back in a few months from now to see what markets it has expanded into.
Of course, exchangebucket.com is in direct competition (sort of) with Diggerslist.com, a similar site with a head start and a little more coverage across the states. We'll see who pulls ahead over time.
What's your favorite online source for new and used building material?