People have it right about the French Bresse chicken and how it has it's own special designation and appellation in France etc and are a fiercely protected breed, but there is an American cousin that people went to great lengths to breed, and they DID import a couple breeders from France years ago through a one-time special agreement. The Bresse chickens born here legally must be called American Bresse, but otherwise they are genetically exactly the same, and several breeders have gone to extraordinarily extensive expense and lengths to breed them. You can buy them at GreenFire Farms and there are a couple other live poultry sellers who have them. They are quite price-y, the lowest price I've seen for the chicks is $49 each and they go up to hundreds of dollars each. They require very special feeding and foraging techniques, you can't just turn 'em loose like you do your other chickens; you must also keep a Bresse Rooster away from other breed hens; there's a lot of serious responsibility in taking this breed on to raise.
Their blue legs are a proof of their breeding; in France at the butcher they leave the legs on to prove they are indeed the legendary French Bresse.
You can get these birds and raise them, I'm in the process myself, just know you'll need to educate yourself thoroughly on the required feeding & care methods. They are beautiful birds, absolutely beautiful !! Hope my post helps those interested in this breed.