I pay 35p per lb for minced chicken, beef, lamb & tripe. Chicken wings & duck necks I think are 85p per 2.5kg
I just get the offal from the supermarket or butcher as and when. Bit of brown rice and some fish once a week. Then a veg cube each a couple of times a week, I make them myself, I mince a load of seasonal veg, some apples etc and freeze them into big ice cube trays about 50mm square.