I get lentils and peas for free at athe grain yard. 200 lbs at a time. Most of the grocery markets will not give away produce, but I have dound one eho was jappy to give me greens. In fact he saves warermelon and cantalopes that are too old. he knows the critters love them.
Ducks and chickens both love the Romaine lettuce.
Onde they get first pick of the produce and scratch it around, i then fork it on top of the compost pile before i give them the new boxes.