I actually had a chance to walk around Toronto this afternoon, instead of just between the hotel and the convention center. I was desperate to find some necessities that had not found their way into my luggage, but was unable to find a drug store anywhere. I finally asked a hot dog vendor, and she replied incomprehensibly and pointed me toward a stairway underneath the tall buildings. This led to a maze of passages lined with stores, and I finally found a drug store several blocks along. Almost all the retail in this area seems to be underground.