I am looking at buying a Smart car now that they are available in canada.
Winter tires are highly recommended. A search on tire rack, tiretrends, and 1010 tires turned up absolutely nothing.
Does this mean tires are dealer only, or is it because the car is so new that the tire makers do not have anything yet?

Front tires are 145/65/15

Rear tires are 175/55/15

I played around with different sizes and came up with nothing.
Any suggestions as to where to buy or different sizes I can use?
The car has been in Europe for 5 or 6 years already.