Sorcha, the green chiles sold here under the name Anaheim have nothing like the flavor of the chile peppers we used to get in New Mexico. I am sure that you get a better product down in the States than the wimpy stuff sold under that name in the Safeways here.
We use some of the green chile powder from New Mexico, but it is expensive and a poor second choice to fresh peppers.
A couple of websites offer cans of New Mexico chile peppers but won't send to Canada. Only the "mild" is sold in cans here and it is without taste. Oh, well, such is life.