another large Canadian supplier is reliable partswww.reliableparts.ca
they will also send out boards to be rebuilt, and they ship to somewhere in toronto, its usually a 2 week turn around when they send them out, but thats when they send them out for me, from winnipeg to toronto(think that is where they go), so you might not have to wait that long
here is what reliable says about your sensor
RPL WB21X5301 SENSOR ASSEMBLY, OVEN 50.97 EA
Items listed below are alternate items (same as WB21X5301).
RPL 12001656 SENSOR REPLACEMENT, LONG 55.27 EA
RPL 8053344 SENSOR 48.32 EA
i think the closest one to you is in Scarborough, but I'm not that familiar with that area of Ontario, check their store locations incase they have one in another city closer to you