I think the Canadian retailer asking price is a bit much @ $650/per, but with that being said, I also don't know how much work it took to bring these in. I'm sure there are of course additional charges to Kel-Tec and Vault for the extended barrel that is required, plus shipping and import charges.
Considering the price differential between the US selling price ($350ish) and the Canadian asking price ($650), I would probably be inclined to buy and try one at some point in time, but at that $600-$700 price range you open up the field of choice to a whole slew of other nice, non-restricted guns that the Sub2000 has to compete with.
Not having handled or shot one, I'd have to say that the biggest advantage this little gun has is that it is now the cheapest (non - 7.62x39) non-restricted center fire rifle in Canada. Also, it's 100% made in the US.
I hope they sell well for Vault and I would encourage them to continue to import guns into the Canadian market place, because let's face it, without Vault, we wouldn't have access to these guns. For that reason alone I think it's worth picking one up.