for 2 lbs of meatballs, I use 1 jar of chili sauce and 1 (16 oz.) can of jellied cranberry sauce.
Stir sauces together in a  saucepan and melt over medium heat. Put
meat-  balls in crockpot and pour sauce over all. Cook  on low until heated through, stirring occasionally.
 I use ready made meatballs. Sam’s Club has some excellent ones!