Our Seattle Woodland Park Zoo sells "zoo doo" each year. I used to buy it, but since I grow organic in soil, and found out from a friend and zookeeper that the beasties are often fed antibiotics routinely, I've stopped.
FYI: Fox Farms lost their organic certification recently. My favorite local gardening mentor let me know this when I went to pick up nutes for my next grow. I used FF with my first grow with great results, but since I want "pure organic" I switched over to TGA -- Subcool's mixes. I'm lucky...
hey! if you need granite dust in the future try calling a company that carves gravestones. i got mine for free. they were practically begging me to take it off their hands....so the best things in life AND death are free! ;