The Watcher wrote:

....snip.....

Look at race tracks, they are generally quite happy for people to take
the manure away.

One problem with racetracks and other sources of manure is that they sometimes
spray their manure with pesticides to keep the flies away.

Also, it comes loaded with worming gunk, so you have to let it stand for
a while to break it down, unless you want to kill your worms (soil ones
that is). {:-).