It is illegal to import R-12 into Canada.
http://canadagazette.gc.ca/partII/1999/19990106/html/sor7-e.html
See also linked article ("It's not illegal to use CFC refrigerants, it's simply illegal to produce or import (them) in Canada,"):
http://temagami.carleton.ca/jmc/cnews/31012003/n6.shtml