Most cost-effective thing to do is get a box freezer and buy a quarter or half cow, or bison if you prefer. You can get a variety of all cuts of meat for about the same price as ground meat, and you can usually get bones and offal tossed in free. Bones are generally meaty, great stew, and the bone broth is the healthiest thing you could imagine. Have some and freeze the rest in sturdy zip bags.