Originally Posted by Hollywood_Zero
In a lot of cases like this, the manufacturer will have a distributor deal with someone local.
The reason they may not ship north of the border is for the very simple reason they have to honour their contract with their distributor.
It may just be something harmless like that and have nothing to do with anything regarding importation.
(At least that's how it works in a lot of car parts!)
Many retailers and companies that do carry or deal in ITAR related products will simply not deal with Canadian customers directly for the simple matter of it being easier not to. That's not to say they won't have Canadian retailers of their product.
There is also The contract thing though.