The Big Book Bunker was, I've been told, actually the world's biggest for a heartbeat of time after it opened in the early 80s. Looking a little seedy now, its huge selection of books makes up for a multitude of sins. They skip most of the giftware you'll find at other Chapters/Indigo affiliates, though they do have a large selection of non-books - calendars, gift journals, discount DVDs, etc.
The graphic novel section is good - the next best thing to an actual comic/gaming store - and as always, you can go onto the Indigo website to check what they have on the shelves. I was surprised to find a large selection of tarot decks behind glass on the second floor, on my last visit.