@rmattoo
Unfortunately public mobile has made it much harder to easily replace your sim card at a local retail location. They are now for sale at the retail level at corporate koodo and telus stores. The MSRP is $10+tax. Use the "Find a store" link to see if there is a location near you. Toggle the list option of the map for specific store details and call ahead to ensure they have pm sim cards in stock.
https://www.publicmobile.ca/en/on/store-locator
Or your other option is to purchase them online from public mobile. If they are half price then I would buy two as its always a good idea to have a spare on hand especially now since they are much more difficult to obtain. Shipping can take 3 days to 3 weeks. If it takes longer than promised to ship to you once it arrives make a note of its arrival date and once you perform a sim swap in your account contact customer service for a credit for the amount of time you had active service that you could not use while you awaited your overdue replacement sim card. Not a big deal if its one or two days but one or two weeks is unacceptable.
http://publicmobile.ca/en/on/sim-card
