Quebec is not like the US in that regard, you won't find a town here that only has a Walmart/Costco. Those are limited to more developed urban centers that have plenty of alternatives.
In this region, there aren't many food/goods deserts.
Even the nowhereville my mom lives in has an H-E-B, Homeless Despot home improvement palace, pharmacy, and greasy spoon restaurants.
I have seen grocery store "deserts" in tiny towns (<2k people) populated by dollar stores while grocery stores are 10-40 miles away. That's the price of living in rural areas. There are other areas in the US where Walmart came in, destroyed local independent businesses, and left.