This wonderful site that lets you identify naturally grown foods in your area. Just type in your search criteria and it does the work for you. You can find any organization listed in your area by their production methods, what they sell, or by what kind of organization they are.
They have been branching out and in late 2010 launched the Ecocentric blog which has articles focused around reaching sustainability in the production and use of food, water, and energy. If you know of a local market not on the site, suggest it! They even have the entire guide downloadable in the form of a pdf catalog to print out.
Start supporting your local markets!