This is totally up to you but I go to food banks for bread for my chickens. There is one here that allows you to take as much as you please but I asked them to set aside what people won't eat (hard, moldy etc)
This may be controversial to some but food banks are the place to get old bread for chickens. One here in Salt Lake City allows you to take as much bread as you like and I ask them to set aside stuff that would otherwise be thrown out (hard moldy etc)
