Pacific Mall at the outskirt of YYZ (where OP is) has the most selection of Japanese Kit Kat at a single location, arguably even compared to Japan. 2 shops at either end of the mall selling the stuff.
You can certainly find more than 4 different flavours threre (outside of the "normal" selection of regular, strawberry and green tea, which are available even at T&T supermarket)
In Japan, Green Tea and Strawberry flavours can be purchased cheap (399 per bag) at Donki .