For example, there's an ice cream shop in Baltimore called Pitango Gellato, that worked with their egg distributor to design a large roving chicken coup on wheels. During the day, they actually wheel out the chickens onto a large grass pasture, and let them roam around free. At night, the chickens go back into the coup, and get driven home. Chickens are happy playing in the nice green grass, and the producer actually saves money because he rents the chickens out to fields that need help clearing insects, same as sheep get rented out to trim grass. In the end, Pitango doesn't pay that much more for their eggs, but their eggs taste much better, and they can advertise by bragging where their eggs come from, and the cool farming system they use.
That's called a chicken tractor, and is a method that has been known and in use for several decades now on a small scall. If you have enough chickens, you don't even have to plow. Even still, there is a legal definition for "free range" and "organic" and neither of these terms are allowed to be used with chickens that use a chicken tractor. If the are
ever locked up, even for their own good, they are not free range. Silly, but true.
"New England dairy farmers have a new product: free-range veal. The milk-fed calves spend their short lives roaming pastures instead of cooped up in pens the way traditional veal is reared. Producers hope the meat will catch on with consumers who avoid veal for moral reasons." -circa 2006 NPR
Get yours at your local Bread & Circus, which must'a been named after "Give them bread and circuses and they will never revolt" -- a whiney line by some Roman poet complaining that the place was going to the dogs.