I tried to purchase a R-134a refill kit (Tried: Canadian Tire, Jarry Auto Parts, Probec, ad nauseum in Montreal), however, apparently retailing a R-134a do it yourself refill kit to the general public is illegal in Canada. I was told that it is imperative that a 'professional' perform the work.
Corrupt Canadian politicians can steal from public funds and get away with it even after getting caught but I can't buy a friggin can of R-134a as per these same dictators.