(It seems like I say this all the time, but maybe not, so here goes again....maybe a few people haven't seen it...yet...
Please become acquainted with any and all [url=https://www.freecycle.org/]Freecycle.org[/url] lists in your area. Freecycle is a way of off-loading excess items that burden you and your home as well as a way of accepting the excess of others that can benefit you. The original (and still valid) mission of Freecycle is to keep useful stuff out of the world's landfills.
However, it has morphed a little over the years and has become a giant, free (no cash transactions permitted, ever) swap meet, but each transaction goes only one way.
For instance, last night on one of my lists a woman requested "large planters." I emailed her to say that I have large black plastic planting pots; how large did she need? I haven't heard back from her yet, but if she wants my millions of 10-gallon (maybe they're 8-gallon) planting pots, she can have at least a dozen of them.
If we complete the transaction, and depending on our mutual schedules, I may leave the selected pots in a location near the front of my house that's not visible from the street. She'll come by and pick them up. We won't have any idea what each other look like. Then she'll email me that they're safe and sound.
I must also say that the "flake rate" on Freecycle is much less than that of craigslist, at least in the Bay Area.
So...go to [url=https://www.freecycle.org/]Freecycle.org[/url], do a zip-code search, and see what's out there. Maybe someone is posting an "OFFERED: Manure" announcement today. Or maybe you can put "WANTED: Manure" and find out about resources heretofore unknown to you.
Sunset Zone 17, USDA Zone 9