Much mislabeled 'chimayo' chile powder out there- most of it is Hatch chile, also New Mexican, but not the genuine strains, which were developed over almost 300 years in isolation, and available on the market only in small quantities. This chile is grown at approx. 7000 feet altitude.
The State of New Mexico has acted to control the name, but without costly legal actions, it may be a long time before the name is protected.

The Native Hispanic Institute sells the rare strain. Galeria Ortega of Chimayo (not California) and Trujillo's Weaving of Chimayo sell Chimayo chile with the unique medium hot flavor. The first two ship to Canada as well as to the States.

The correct link will get their addresses. But here it is again:
Genuine Chimayo

Galeria Ortega also has a website:
Galeria Ortega
A map showing the location of Chimayo is at their website. Their 'chimayo' is much cheaper; I don't know its purity, but it is quite good.