It has been bought to my attention that there are areas of this country that have neither co-ops nor farmers markets. As someone who lives in a city with three co-ops and over 6 farmers markets I just cant wrap my brain around that concept. But if you have the misfortune of living in one of these areas without basic services, here are some options
Start a Buyers Club, outfits such as Mountain Peoples offer members of the public the option of ordering direct and receiving not only a discount, but home delivery as well. You and some friends and or family get together and order from a catalog chalk full of organic, GM free foods from a catalog that offers prices below what you will find in stores (though not as low as actual wholesale) You call in your order and they deliver it to a designated address (one of the members homes) as part of their regular wholesale deliveries. Most have a minimum order, say $500 per order. Some families find that they spend that much themselves, others go in with one or more other families. Here is a link to a site who can help you find resources for a food club supplier in you are.
Join A CSA (community Supported Agriculture) farm. CSAs offer "shares" in the seasons bounty, your share entitles you to weekly deliveries of fresh, seasonal organic produce during the growing season. Heres a link to get you started
Demand better from your local store. Quite simply, retail stores, including grocery stores, are in the business of serving you. When I moved into this house 4 years ago, the Conventional grocery store down the street carried three organic items: milk, eggs and rice milk. Today they have organic options in almost every category. Thats what relentless pressure from single-minded, belligerent mamas will get you. Insist on getting what you want, when I would go in there for eggs and found that they were out of the organic eggs I would grab an employee and ask for the organic eggs --were there more in back??-- if they had none I refused to by the conventional ones. I made sure they knew that, and knew why. It works.
Grow your Own. Easier than you think, more satisfying than you can imagine.