There's an awful lot of offel that is usually thrown away when butchers trim meat to leave the cuts that sell. Just wondering if you were buying some chicken thighs if it's worth asking if they can throw in some of the throwaway stuff for free? It's the sort of thing that a local butcher shop here would do, if we're talking about supermarkets it will more than likely depend on the person serving you bending the rules and applying some common sense.