BMV books has 3 locations in Toronto, so if you live here, it's an absolute recommendation. You can buy or swap or sell books, DVDs, music. If you're looking for copies of classics for your lit class or even old textbooks, you can find them here for WAY less.
The best part? No one gets mad ( or at least shows it) if you grab a book and start reading on the floor. It's even on their ads!
The prices are great, the conditions of these books are amazing, and I love them. Their service is always decent, sometimes amazing, sometimes not stellar but always on par.