Courtesy of James K., Virtually Green, San Francisco CA
Basic wholesale organic pricing for some major metropolitan areas in the USA can be found using the Rodale Institute organic wholesale prices online tool: http://rodaleinstitute.org/farm/organic-price-report-tool/
The USDA has quite a bit of different kinds of pricing info at: http://www.marketnews.usda.gov/portal/fv
Find out what restaurants are paying for the crop in your area. If your crop is organic then find out the organic pricing. Then ask some chefs what kind of premium they’d pay for the crop if they could advertise it as locally grown and freshly harvested: some will pay a premium. Also ask chefs what additional premium they would pay for a special variety of the crop harvested at a specific stage of growth: this is where you tailor your crop and harvesting to suit a specific restaurant client.
Using the above approach you may be able to find some chefs who will pay you retail or higher prices for your crop.