I bought some veg from the market when DS2 and family were staying back in August as DiL2 is rather fussy about not using packed goods from the supermarket.
Our market consists of one veg stall and a couple of vans selling meat and dairy, once a week on Tuesdays.
As it was a really hot day, the lettuce was limp and tasteless. So it's back to the supermarket for me, where the veg are cooled and protected from the sun, and probably have a quicker turnover. We are in a very small town and only have a couple of supermarkets and a Lidl.