You can contact Salvi Harps in California info@salviharpsinc.com, or check the website http://www.salviharpsinc.com. They may be able to send a transport cover directly to you and certainly would know who carries them in Canada. I have the Salvi transport cover and like it a lot. However, you do need a waterproof mat to put under it when loading/unloading it outdoors. The base cover is in two sections. I always use an outdoor mat with a rubber bottom just to make sure the harp does not slip when tilted to load or unload.
Also, I have seen a harp cart that has what looks like a snow-shovel bottom which would be good in a northern climate. I do not know the maker.