I don't usually buy things specifically for chickens, so they only get the unwanted bits. But you can get a lot of bang for your buck that way. The leaves and stems of cauliflower, rinds and seeds from squashes and melons, carrot tops with a bit of the root. I tossed a carrot top from a carrot as long as my forearm and it took the flock 3 days to make it disappear.
Where are you? You can put your location in your profile, and then if you ask questions, people can tailor their advice to your climate. Your state is fine, and if you live outside the US, it helps to know that too. A lot of things we can get here in the states easily are hard to find in another country.