You'll need 1 (18-ounce) jar grape jelly, 1 (18-ounce) container BBQ sauce, and 1 (32-ounce) bag frozen fully-cooked meatballs - about 50 meatballs. Combine grape jelly and BBQ sauce in the crockpot. Add meatballs to the crock and toss well to coat them all in glaze. Cook according to the directions in this recipe.