That's of course what will be cheapest and most prolific in any supermarket.
A word of caution though, the farmers selling fruit and veg from the street stalls in cities just get their products from the wholesalers, much the same as supermarkets. It isn't fresher or more local, however it is sometimes lower quality.
farmers selling fruit and veg from the street stalls in cities
Depending where and who. In my town I had a local stall that did go to wholesalers but very local like 20 km radius. And on targ you had sellers from specific farms. I even know a family with a farm and the son was going to targ and sold the produce.
I remember in the open air market in Ljubljana there were stands from specific farms and there were signs with the address... I don't know if that would fly in Poland but I thought it was a nice touch.
Update: For the fans of KAUFLAND here...they plan to buy about 100 former REAL markets from that russian finance tycoon...they have already asked the german federal cartel office to control this fusion. Also EDEKA plans to buy about 50 markets. But many others will be closed or, if buyed out, changed into something else.
For me personally interesting ist that the online market place "real.de" will probably live on under new KAUFLAND ownership. I liked real online...good offers to moderate prices and easy delivery. A real life saver during Corona! Of course also abit overwhelmed during the beginnings...it was hard to get delivery slots and no paper ware (wc tissues) at all :)
PS: KAUFLAND belongs to the "Schwarz Group" which also owns LIDL....