Are you going to do the meal plan first, before the farmers market? That way you won't buy what you don't need?
I understand what you mean, but no, I'm doing it the other way round. I've never been to the farmers market before, so I don't really know for myself what kind of cuts they'll have, all my info is from the woman I work with. But I know what kind of cuts I'll use, so I don't intend buying anything I wouldn't know how to cook. Then its just a question of separating out the meat into meals to be frozen, ticking off the relevant items in my pantry and writing down a (hopefully very small) list of additional necessary ingredients. For instance, I have a lot of those packet meal bases, that need things like sour cream or mushrooms - I don't keep those things in stock, so to use up the pack I'd hafta buy the sour cream y'know?

It all makes sense in my head anyway