I think some of us are taking this "idea" way tooooooooooooooooooooooooooo seriously, in fact, absurdly serious! I haven't looked up the population of Parkville, Montana, and I am not going to bother to do so, but the bottom line is this as I see it: If you think you can make a nickel from it, just try it! To start with, you have a poor marketing plan, in that all or most of your expected growers/sellers are going to have their own roadside stalls anyway, or customer monthly contracts where they deliver produce 12 months of the year, for a set yearly fee or are already selling at farm markets, and/or to local grocery stores. Hard uphill sell to make a nickel under your idea? BUT, worrying about insurance, business permits, etc. for an idea which may not make you a cent, is absurd! If your idea starts to come into fruition, and you are really making serious money, and perhaps negatively impacting upon local taxpaying businesses, then and only then, may someone try to bring down "The Law" on you! "Dare to be a Daniel!!"
Couple quick "idea" stories from my past: When I was 8 years old, my pal and I got a Plaster of Paris rubber mould somewhere-from a magazine, it was a wall hanging plaque with a basket of fruit. We made them, and painted same, sold hundreds of them around the neighbourhood! A little later in life, while already "Professionally" employed, me and a pal of mine went to a glass auction, and bought a 8' x 8' case of plate glass, with the idea to make aquariums out of same. We noticed that major brands used silicone seal to put the glass together, so in our spare time, we learned how to cut glass, and silicone them together. Hundreds of people came to my house on evenings and weekends, to buy aquariums. Then they wanted to buy fish, heaters, thermometers, every thing! Took the "idea" out of my basement, and opened a small pet shop in a small garage, and called it "Pet Stuff". Instantly, a home run "idea"! And there are several others, however the point being not my part time achievements, but your "idea!" If you have reasoned it out, start small, invest as little money as you have to, and give it a go! Don't concern yourself unduly about local regulations, until you start to get serious 'traffic"!