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Canadian Tire always has oil on sale
This is VERY true. You would have to purposely aim for a NON sale oil. Canadian Tire up here in Canada ALWAYS has some oil on sale, and it always shifts around from 1 brand to another, including their house brand. So anything synthetic would be my go-to. I stopped using conventional over 10 years ago.
If not shopping at Canadian Tire, Costco up here regularly stocks Castrol Edge Synthetic for $30. Walmart has the same oil for almost $50 when its not on sale.
However I've started accumulating a small stash, made up primarily of PP, with some QSUD also thrown in, so I doubt I would ever have to really go and buy oil off sale.