I make my own, almost always using lamb bones. I aim for at least 6-8 hours in the pot, but have simmered them for double that time a few times. It's just so easy to make and so much better with my 100% grass fed animal bones, just so tasty, that I've not looked around to see if I can buy it packaged and done for me. Whenever I get hungry, I just drink a cup. Sometimes I even blend the veggies that use in the pot along with it and make almost a soup, which makes it even more filling.