Don't need one in Toronto within a ½ day or so of the snow stopping for the major bicycle routes (including the MGT).
Calgary apparently also does a good job of clearing its bike lanes.
And I do my Costco shopping by bike year-round. I think I've used the car for large purchases at Costco twice in the last year.
I _rarely_ drive my car anywhere in Toronto, and find the streets on bike safer than most of the sidewalks in January -- they get plowed sooner than most homeowners and businesses clear the ice from their sidewalks.
And in Toronto we're rank amateurs at winter biking. Look at Montreal, Oslo, or Helsinki for even better examples. Too bad we've got a addle-brained carhead who doesn't understand public safety or doing his own provincial as our premier.