Oops, just noticed you need BC coverage.
Very few policies offer coverage but I believe that AAMI may be an option.
Annual policy with ski extra adds very little overall, but they are expensive if you need just cover for a single trip. I actually need unguided off piste so I am only happy with QBE. Insure4less will do it for an exorbitant price.
As an example, my annual cover including ski is $415.