I went to a seminar today by two young farmers starting a permaculture farm. They sell their greens to the local coop, which are heated with a passive solar system. They are off the grid and live in a yurt. The set up is a complex, with perennial polycultures. She said the market was no problem--one crop is asparagus, which is hard to find organic. They'll have their pick of buyers. It was really gratifying to see people really executing their values.