Consider, too, that by waiting until Saturday afternoon, you're buying produce that's been outside for two days. Price and volume improve, but quality and selection decline. By the end of Saturday, the market has the feel of anarchy. I want to go home. Each stall closes on its own schedule, so you could find yourself buying oranges from one vendor while people are digging through the pile of oranges discarded by the vendor next door.
Some customers come armed with a knife, and pare away the spoiled spots on the spot.
The goods come from the same place, the Chelsea Produce Market, that supplies restaurants and small grocers across the region. If you don't notice until you get home, though, the best you can do is chalk up the loss of a dollar or so, and not shop with that vendor again. Surrounding streets can get pretty clogged and traffic enforcement is not always what it should be. We make a point to go in there several times a day. I can attest that they do tow on occasion.