Costco Implemented NO MASK NO ENTRY policy as of July 18 2020 ( Ontario and Quebec only)
If you are, you might want to cancel your membership as well and never ever sign up again. Don't support a company that takes away your freedom.
Seems like we might get a 2nd wave according to other countries. I think every Costco should implement this policy since it is very hard to "social distance" inside the warehouse.
Costco East: ON, Québec , NB, NS & PEI