Actually, from the photos it looks like they were selling BresseWonderful wonderful pictures!! THank you for sharing these photos of your trip.
I suspect that you don't see any live Bresse for sale because that protects the stock and helps to keep them exclusive.
I have started leaving on the heads of my birds until the point of putting them in the pan. IT is strictly a matter of convenience as seeing the head "wigs me out" and generally makes me feel uncomfortable. Legs come off asap, as they too make me uncomforable still on the bird. In the pictures above, I don't see any leggs. . . or are they just hidden by the layout of the display??