I suppose it depends on if you're a casual hobbyist, or more involved.
When I lived in the states, had never bought any fish from either of those stores, for one,
because
I would never want anything that could be in the least considered a hybrid, or mutt, so I will pay to have pure bred species shipped,
unless I know a respected breeder near me.
But to tell you the truth, neither of those store ever carried any of the species I wanted, so it was actually a moot point.