I know Cottage Gardener sends out catalogues. They aren't the prettiest (black and white newsprint, no images), but they have a decent amount of the harder to find heirloom seeds which is why I like them. I get most of my seeds from them.
I do most of my ordering online, so I'm not certain if they have catalogues or not, but Greta's Organic Gardens and Salt Spring Seeds are two of the other Canuck companies I look at.
I'm very much an OP fangirl, which is why I stick with those companies. If I can't find what I like there, I'll usually hit Baker's Creek since their shipping to Canada isn't bad.