I buy organic chicken broth/stock in the box from Traders for $1.99.
I agree that boiling the whole chicken or parts of the chicken with bone (not just the boneless, skinless breast) is the way to make broth. But I don't know that you NEED to make your own broth.
Are you feeding chicken breast and rice every day? If so, you need to be adding a supplement, veggies or somehow getting vitamins in her. We do it for a treat on nights that we eat chicken, but not every day. I don't boil the chicken for them though. I just cook extra using whatever method (grill, pan) we use.