Forget it about what is sold under the label "France" at the supermarkets. Horrible stuff and bottles without any interest catch the shelves and this is expensive ! 10 $ or more for a poor vinegar !
On the second hand some groceries owners manage to find a pleasant little something which would be affordable. So the mix in these labels of dreadful stuff and nice little wines.
I had luck in this that the owner of the closest grocery is french. Without being a real "connoisseur", he always finds a way to have something a little original in the shop. As an example, I found there the Champagne "Oudinot" and definitely I suffered worse Champagnes before !