Info:
Winter tire laws in Canada vary by province and territory. Quebec is the only province with a mandatory winter tire law for all passenger vehicles, taxis and rental cars. In BC, the law requires winter tires on designated highways. In other provinces, winter tires are not mandatory but are highly recommended.

Using Winter Tires
Preparing Your Vehicle for Winter

On rims versus off rims: There are pros and cons to both – you decide what works for you. Off rims mean a longer appointment to have the tires put onto your existing rims. They are easier to store as they are not as heavy though. On rims means they will cost more to purchase initially but the install is faster and often less expensive.

Stores like Canadian Tire, Costco and Princess Auto sell tires. You can often find gently used winter tires from online places like Kijiji or Facebook Marketplace sold by individuals.