I think Michael Garron hospital downtown still has appointments for Phizer, the last time I checked...they had appointments open for tomorrow and Wednesday for 2nd dose of Phizer. That's the only place I know that's guaranteeing Phizer still because they were leaving Phizer for kids, but most kids in that area already got their 1st dose so slots are open
Link for Michael Garron:
https://uht-public.vertoengage.com/
But yeah Malcolm's right, the Phizer shortage will be over in a week or two anyways. I signed someone up for their 2nd dose next week at a pharmacy, so I'm guessing it'll be much easier next week. But if you're antsy and you didn't mix yet, go to Michael Garron hospital