I feel bad for those people who are going into the Indigo across the street. If they just took the time to survey the neighborhood, they would (like me) discover the little used book store that is the BMV.
They have small-shop rules like "no cellphone conversations" since it's such a small space, and will put a sign on the door to let you know if their debit machine is down (no worries if it is - all of the major banks are a hop-skip-jump away from this location). They even let me snap a few engagement photos inside the store!
For a gal that needs a book in her purse to survive the TTC, this is my recommended place for books.