Seattle has at least 15 community markets at last count and it's growing all the time. Some of them are more arts and crafts oriented, some try to sell a little of everything. The one thing they all seem to have in common, is a focus on products made or produced locally. The Neighborhood Seattle Farmers Market Alliance focuses on farmer/food only markets that are community-based in Seattle Neighborhoods. It's a non-profit organization as well.
Here is a short video I made of tips on how to use their website: