Had a huge pile of horse manure that just kept stacking up higher and higher each day. Of course that happens when you have horses. The estimate is 50 pounds per day per normal sized horse.
So about every 6 months or so I put an ad on Craigs List saying that I have aged manure for gardens, compost piles, and worm beds. Usually in a week or so all that aged manure is gone. Just wish so of the people that want the 'aged' stuff would get the 'fresh' stuff and let it age in their yard instead of in my yard.
See www.craigslist.org where you can find just about anything you want. Both free and for sale.