Where can I buy a Wheeled Cat Carrier?

I can't help you with Toranto but I have a wheelie cat carrier. Our male cat weighs 15-16 pounds and the vet is 8 blocks away so he's too heavy for me to carry otherwise. So we got a wheelie from Petco that looks like a piece of luggage with screen sides (handle retracts like luggage, I never use it like a backpack which sort of defeats the whole purpose of getting wheels). I like it except the cats get scared from all the loud trucks and the commuter train, passing dogs, etc. they are used to dealing with which we have to pass on the way to the vet and this carrier does NOT come with flaps that can be lowered over the screen sides. I just wrap a big old towel around the whole thing (like tea cozy). It works pretty well except them our big male decides to suddenly move himself from one side to the other imbalancing the center of gravity, then it will start tipping and I just have to stop and wait until he's settled again and carry on. I also wish the entire bottom would unzip (or otherwise be removable) so I could stick it through the washer after each use since sometimes while waiting (and waiting and waiting) in the vet office the cats will pee if a dog comes in.

The only places I've seen them are online. We just bought a wheeled cart for putting the carrier and show stuff when we go to cat shows. Once the cat is over 10 lbs, those carriers can get heavy.

You probably will have to buy one online.