I'm afraid we've already run the gamut of Canadian pinball parts suppliers... that didn't take long
Playdium store is okay for some common stuff, but forget game-specific. I dont even bother looking in Canada any more. The others listed are your best bet.
If your in the Toronto area, A1 Electrical on North Queen carries a ton of electrical parts, tools and other assorted items that come in really handy. That's all I got.