There's always a way around laws and some kind of loophole to exploit.
Although there's a certain quaintness to places with no Sunday shopping,
but having been to NS just recently I have to admit that you can a) be
very accustomed to being able to shop when you need b) find it very
frustrating to not be able to get necessities (I don't know tire
puncture sealant) when the need arises.
So a minor hooray for Sobey's for working out the way around it.