I buy several whole chickens, cut them up at home, remove skin and bones. The chicken pieces are packaged for the freezer. The skin and bones are put into a large dutch oven with water to cover, onions, carrots, celery and a sprig of parsley, salt and pepper. It boils for a couple of hours, I remove the bones and skin and let it cool, skim off the fat, and pour it into icecube trays then into containers for the freezer. The broth is used for soupstock, and also added to twice baked potatoes for a better flavour than butter (I think)!
But you can come up with all kinds of ideas to use it for and it is virtually a free grocery item.