Making your own is a win!

Easy ... I save all bones from my cooked meals in a large zip lock in the freezer. When the bag is full I dump it in my pressure cooker with misc. herbs, garlic, salt, peppercorns, various vegetable clippings that I may have saved as well (like the trimmings from asparagus, carrot stubs, cauliflower leaves etc), sometimes onion, whole ginger or tumeric and a couple dashes of vinegar. Really, whatever you have, but works just as well with only the bones. When you have a mix of poultry, pork and beef bones, the broth comes out a rich golden colour with a great all purpose flavour.
Cook for 3-4 hours. Strain and pour in ice cube trays. Freeze and bag.

My small dogs each get a cube a day as a supplement to their prey model raw diets, and I can pull out as much as I want for drinking, or flavouring soups or gravies.