I give them veggie and fruit scraps and egg shells on a regular basis in the winter. Most meat scraps go the dogs, but during molting season I give them to the chickens.
Most of my old bread gets saved for stuffing, so they don't get much of that.
If I find discounted cauliflower or cabbage, I buy it for them.
Last year I bought 8 large pumpkins from Aldi's for $3 each. I was everyone's best friend then, let me tell you!
During the summer they get to forage, so most veggie scraps go in the compost, but they still get most of the eggshells and fruit scraps. Frozen melon guts and peels are a lovely treat on a hot summer day.
When we get a heavy rain, I collect worms and throw them over the fence. They go nuts for them, and it's cheap entertainment for me.