Hi Gordon. Welcome to our little corner of the 'net.
No idea where you could find one.. certainly not Canadian Tire. They are usually less than helpful in this area. They are all very similar. I just did a google on "mastercraft snowblowers" and it appears a lot of them were built by Gilson Brothers, which was purchased by Lawn-Boy. You "might" be able to get some information from them.
If you can't, you can always buy a router and take up woodworking this winter.
Sometimes I wonder whether the world is being run by smart people who are putting us on
or by imbeciles who really mean it.