Guitars, Musical Instruments, and Musical Equipment from Guitar Center
Not sure when they started shipping to Canada, but I guess it's now an option. (Correct me if this is old as shit)
Though i'm sure you still can't order an EBMM, or Dimarzio's because of their international policies, (And apparently a Petrucci model is too heavy to ship to my country ) but they have a couple of nice t-shirts!
Plus, no D-Bag salesmen!
I know MusiciansFriend and Music123 (all the same company as GC) have been shipping to Canuckistan for a while, but yes, certain brands are limited by their export shipping agreements.