I like Farmer's markets, I got my Egyptian Onion sets from one.
I like to look for the unusal items that I can save seeds from, as well as, the tasty items, that I don't grow... like onions. I do notice that local farmers markets don't grow onion bulbs for sale either. Lots of green onions, and the one time the lady had Egyptian Onion bulbs.
I do sometimes wonder if the vendors are mostly fruit stand vendors, because so much of the produce, looks so much like what you see at the fruit stands. I suppose that I expect homegrown to look different.
I know, my homegrown never looks like a plastic model of produce, nor does my neighbors produce, but very often the farmer's market produce is so perfect, that it looks fake! How do they do that? My cucumbers curve, or have a slim end etc. My tomatoes are normally just barely out of round etc... How do they get perfection?
Talk to your plants.... If your plants talk to you... Run!