I don't know where you live in Canada, but if you live in the lower mainland of British Columbia, Kind Ed pets in Burnaby can't be beat for their prices on equipment, refills, media, etc.
I just picked up the largest bottles of mela fix and pima fix (16 oz) for only $11.99 each there and their hikari blood worms, the large flat pack was only $13.99 whereas it is usually $16.99 or more everywhere else.
The downfall...the place is CRAMPED! I'm not sure about their livestock either. It looked kinda iffy.
I also just got fluval 304 at my local store,Pauls' aquarium, last week and it was only $99 bucks. It was the same price at King Ed's.
Check around and make sure you're getting the best possible deal.