The Vitamin Shoppe and many other places sell it under the name Moroccan Red Clay

Red Clay Powder Moroccan by Now Foods - N8-1167 - at The Vitamin Shoppe

Priced reasonably and free shipping over $25 at the site in the above link.

Link below is cheaper and free shipping at $20:
http://www.iherb.com/Now-Foods-Solut...6-oz-170-g/778
Team Wash and Go!