There's a place on the south side of St. Catherine West, east of the Future Shop, that has a lot of used music LPs, cassettes, magazines and adult magazines and videos. It's in the basement and isn't very tidy, which makes looking for specific things somewhat difficult. I can't remember the name of the store, and haven't been in the area recently to check. This is probably what you are looking for if you want to trade or sell.
