The 370 is a fairly rare car to start with in Canada, there simply are not a lot units sold each year. Those who do buy them are for the most part, enthusiasts, so the likelihood of selling is low. Until the car is redesigned, you won't see people with a reason to sell it unless they simply don't like the car, or have to move on for other reasons - again, rare.
There are a lot more for sale south of the boarder. As stated, do a search and you'll find a ton of discussion about the pro's and con's of importing from the US. For a used car, it makes sense.
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