BC-Biodynamic Compound Preparation is available at JPI http://www.jpibiodynamics.org/node/403 BC
And in Japan through Ben and Konomi.
707-1 Nishi Biribetsu
or by telephone 090-5959-3660
JPI has given many workshops in which numerous people have been taught to make their own BC.
JPI may be able to arrange for you and your gardening group to have your own workshop on your site with an instructor who has been through a JPI workshop on BC.
Call us for possibilities. (276) 930-2463