I always got some for an old roomates dog from Weigles/Paolini's sausage. The ones I got were pig leg bones, they smoke 'em with what I'm guessing is the bacon or what have you. I would freeze them as they would go bad. The dog showed up with an excited look every time it heard the freezer door open or close
. I think they're a buck apiece, unless the price has changed in the last few years.