Believe it or not, even after taking into account exchange rates, it is still more expensive to buy them from Canada! Just compare the price between bigalsonline.ca vs bigalsonline.com.
I order most of my supplies from US online stores even though Canadian government adds another 15% in tax plus high shipping...
You could be in luck though - supplies & equipments are expensive, but the tank itself seems to be reasonable, if you have access to Big Al's in your city.
I _think_ I saw one 55g tank for under $100CA, and 78g for under $140CA. They are made by Perfecto...