You virtually can't buy SE blades in a brick and mortar retail store in Canada either. The SE blades I have bought in the US at drugstores/chemists have not been the Personna Gem stainless steel coated but just plain carbon steel ones which can't hold a candle to the former in terms of performance. If you are going to use an SE the Personna stainless steel coated blade are the only way to go imho. As a bonus you should be able to get more shave per blade than with a DE.

Bob