Ummm - I'm not sure about this: I'm sure a qualified CDC will be along in a mo to give you better advice on this - but where is she getting her stock from??
As far as I was aware, Cambridge will only sell to qualified registered CDCs. Sorry, I might be wrong but this sounds a wee bit dodgy.
From an official source, the RRP for 21 packs (3 per day on SS) is £32.50 although some CDCs charge a little more (this is permitted).
Vanilla / Toffee & Walnut / Chocolate / Choc mint / Cappachino / Banana / Butterscotch / Strawberry / Fruits of the Forest
Vegetable / Chicken & Mushroom / Spicy tomato
Bars (all chocolate covered)
Chocolate / Caramel / Malt toffee / Choc orange / Peanut crunch / Cranberry crunch
Chocolate & Banana
Water flavourings (Summer Berry & Orange)