I don't know the address, but The Barn is located off Airport Way on 148th Avenue.
A coworker of mine turned me on to this place. Its a huge barn that houses a produce market. The majority of the produce is from local farms with some popular items brought in from other NW farms. The quality is great and the prices are better than the super market. I've never gone into The Barn looking for an item that they didn't have in stock.
To round out their selection, they also sell fresh honey, seasonal plants and seeds. The staff are all friendly and helpful.