I also consider myself to be a freebie queen and used to have one of the top REAL freebies and coupon websites in the country (before spam sites gave it a bad name).
I wondered about asking for bagged leaves but was concerned about chemicals neighbors may use on their lawn.
I like to use clippings off feed bags to decorate my coop. I wish our grocery stores had a food recovery program, but I do have a garden, and we keep all unseasoned table scraps for the birds. We have 38, so it's a supplement.
I find Getting pallets from local lumber yards helpful, as well. They work for gardening and making herb gardens for the chicken run.