Ellis, I don't know where you are located, what kind of place it is, etc, but many areas have riding stables or town composting operations. I have also collected chopped leaves from park departments,
coffee grounds from a
local convenience store, even shredded paper, as well as downed branches after storms, etc.
Our local riding stable just piles up the manure and bedding in a big heap, free for the taking. Some folks don't like horse manure, but it makes great compost or a nitrogen layer on top of the wood, with wood chips, spoiled
hay, straw, leaves, etc on top to help keep weeds from sprouting. With a thick enough top mulch, not much will come through, and what does is fairly easy to pull, or let
chickens forage on it if you can have any there.
I have plans to form a rain garden in my front yard once the snow is gone and the ground thaws. I am hoping this will help channel water to plantings so I am not so dependent on the hose.