From experience, you can't lose with either Yamaha or Honda .. although I have no experience with either snowblower, I know their engines are virtually bulletproof. But nowadays, even their engines (Honda) are getting the El Cheapo treatment with PLASTIC camshafts, and timing belts - failure prone components that have no business in an industrial engine, IMHO.
Can't go wrong with Yamaha. You might find someone on eBay from Canada, or just a dealer in a search, that might be willing to ship one to you. Worth a shot. Will probably cost you in shipping though, but at least you won't be fixing the thing every year. MTD ruined many American brands.
Ariens is the best you can buy outside of the jap ones, even today. If it were me, I'd find an old Ariens - simple design that's bulletproof - that's been restored .. or restore it yourself, and install a light and some heated grips. Will be just as good, if not better, than anything you can buy new.