After searching for a tank for over a month in local pawn shops, classifieds, freecycle, and craigslist, and only finding a few tanks, many of which were gone in a flash, I got refered to two sites.
canreef.com and bcaquaria.com
BC aquaria is strictly for people in BC, but canreef has sections for all over canada. They both have a buy and sell just for aquariums/equipment! Within two days of logging onto canreef, I found a tank, and bought it two days after that.
Hope this helps out any other Canadians out there who are searching for a good deal on a tank.
Oh ya, they're also great if you're into Reef tanks, as that's what the sites are initially for