Where I got them is Makarios RV Parts and RV assessors they are in Indiana, they have a web site you can check it out they were half the price of Camping World.
The part no is 3316255.011-M
Now I do not think they will ship to canada, there is a Dometic office in Mississauga, you can try calling them there or any RV dealer can order them?
I payed $68.00 us for them
web site is
www.makariosrv.com.
Also I am in Florida, for the winter