I realize this question was asked a million years ago, but Canadian style sour cream refers to sour cream that has different texture from that of a standard american sour cream, as well as a bit different taste. Canadian style sour cream is usually creamier and if you were to remove some sour cream with a spoon from the tub, you don't have a definite indentation or a hole left from the spoon (like you would also see in a tub with greek yogurt), instead the sour cream just flows back in to fill the gap. Also, canadian style sour cream is sweeter than the American style sour cream.
In short, if you want Canadian Sour Cream but don't want to pay extra for it, just stir the american sour cream with a spoon until smooth, then keep adding enough heavy whipping cream and stirring after each addition until it's desired consistency. I do this all the time :)