the soups and shakes are the same prices, sometimes they can charge more for the tetra packs. But she could be referring to the fact there there are other programmes ie if you are over a certain height, you have the option to either have 4 packs a day or 3 packs and some skimmed milk or a very small meal. Thats where the added expense could come in if you decided to have 4 packs a day