That's really too bad that produce gets wasted rather than giving it to folks with chickens or rabbits or other animals that would love to eat it. For now i buy greens at the 99 cent store. They don't always have a good selection, but sometimes have the same bagged salads you pay $2-3 in the store. They almost always have cabbages and cauliflower heads. One time i hit the jackpot when they had a whole bunch of romaine heads, big ones, three to a package, for only 99 cents!
i just wish i could find a good source for cheap frozen peas for my ducks. Cheapest place i've found so far is Winco, 2# for $1.48.
i saw a news show with Lisa Ling on freegans. They went behind stores and restaurants and collected perfectly good food that had been thrown out. i think it was filmed in New York. Wish we could do that here.