A commercial grinder at least 1 HP – runs around $500+. I use a Weston 22 and I can grind whole chickens, young ducks and turkeys and pork ribs and lamb ribs. I haven’t tried beef ribs as they are pretty hard and don’t want to possibly break the grinder! But they are really good gnaw/recreational bones. Cabela’s has some grinders too. I can buy most ingredients (heart/gizzard/kidney/spleen) for less $2 and depending on what kind of chicken you prefer, large bags of chicken thighs are $0.39/lb or organic chickens are $3+/lb. You can buy whole turkeys cheap after Thanksgiving and stock up. But you will need a freezer too! I’ve ground 100 lbs in 15 minutes before.
There’s a demo video here:
http://www.northcoastpets.com/barf_hardware.htm
