If you make 100K a year in Canada you pay $29,986 in taxes of which about a third goes to healthcare, so $10000 annually and you still won't get tested preventatively.
The difference is that the US cost is true whether you're wealthy or poor (above a certain margin). In Canada, if you make the median household income of $35k, you presumably pay proportionally less (or even less than that; I can't be bothered to look up the progressive taxation margins) in taxes, so $3500 max.