Never forget that your butcher throws away a lot of good food because the customers won't buy it, too much trouble. If you ask you may find the your butcher fillets his own chickens to get the boneless chicken cuts his customers want. As him about the carcasses, he is probably paying to have them taken away. They boil down to make wonderful chicken stock with bits of meat and can be easily frozen. Always good to have in the freezer if you are starting a stew.....
Good dog food as well, I fed Big Jack the lurcher on chicken carcasses for five years.