This is what I fear from any car from Quebec...
When I was searching around for used Mazda 3s I would search nation-wide out of interest. Ontario and Quebec did seem cheaper much of the time, and I was curious if this was due to generally higher mileage or corrosion issues.
If it was me saving 15% wouldn't be worth it due to the costs of getting the car home. Also, if you're buying from an Ontario lot do you pay the HST?