I find that bookcloseouts.com has both better prices and a better selection than most used bookstores. They ship from Canada, too, so there are no surprise cross-border fees. There's usually a coupon or two available on redflagdeals to offset the shipping costs (eg $5 off with coupon: world password: bookcloseouts).
There used to be a pretty good one on Mount Pleasant just south of Eglinton. It was near my favorite TO pub. Not sure if they moved or just plain went under..?
The sale at Victoria was disappointing. I got there an hour and a half after it opened. I think the dealers pick the place clean early on. It wasn't always thus.