Genuine Chimayó chile, grown for 350 years near this village in northern New Mexico, is available from the Native Hispanic Institute, Marie P. Campos, Santa Fe, for $15 per 5oz. package of ground red, $12 per pkg. if 12 or more are ordered.
The website is interesting and worth a visit.
Authentic Chimayó Chile

The State of New Mexico has acted to protect the name. There are imitations grown elsewhere, using inauthentic strains.

Two other sources for this unique chile are listed at this website, both located in Chimayó.