Different kind of high quality cheeses, butter, yoghurt and other local delicacies are sold for very reasonable prices. You can indeed taste the difference from supermarket bought equivalents.
Eggs are on sale too, so it's a good chance to stock up some for the Easter days.
My personal favorite is Nellestijn, with its gigantic dog, well kept cows and cute lambs. Try the zeer oud cheese, the yoghurt and the mustard with honey.
Fun fact: the daughter of the owner was the first girl to appear on the popular Dutch TV show "Boer Zoekt Vrouw" (= "Farmer looks for a wife"), although I am not sure if she managed to find love (or an husband, or both) on that occasion.