I think LA is appointment only now? Cool store though. Tundra is worth a visit in person sometimes. Cosmo was always my favourite, but it is no more... There's Long & McQuade everywhere, they're basically our GC. Some neat stuff in the used sections often. Their Toronto stores definitely carry more interesting stuff than most other locations.
E: get loud has neat Gibson stuff any time I've gone. ** it's also a bit of a trip, you won't find much there you wouldn't at a L&M