@ccrow : Google Zoo Doo and you will find it (a mixture of poop from many animals) being sold at, among other places, the Louisville Zoo in Kentucky and Woodland Park Zo, Seattle. The Phila. zoo also used to sell the dried compost.
“If you want the chance to purchase Zoo Doo or Bedspread, send a postcard from Sept. 11–25 (2009) to: Zoo Doo, Woodland Park Zoo, 601 N. 59th St., Seattle, WA 98103pick-up. (Only one postcard per person allowed.)
Postcards will be randomly selected and Dr. Doo will contact only the lucky winners. Pick-up dates are Oct. 9–25 (2009). You’ll have to load the compost yourself, but the zoo will provide shovels.”