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I always just bought bone meal (usually from garden supply places) and made my own charcoal. Sealed it in a crucible and cooked it for a couple hours at 1500 degrees. In addition to bone meal, I also used powdered milk.
I buy mine from Ebonex in Chicago. I think it is in 40lb boxes. The product is reasonably priced but shipping is expensive. I use a mixture of 1 part bone, 2 parts wood so a box goes a long ways.