I'm lucky to live somewhere where I have a selection of supermarkets that I can walk to which all stock fresh foods for reasonable prices, sounds like you're in a similar situation.
In America they have loads of these "food deserts" (old article now, but it's gotten worse) where the only place you can buy food without having to drive an hour, is a Dollar General store that only sells shelf stable, processed rubbish. There's no amount of money you can spend in those towns to get anything fresh, not that the residents typically have much to spend anyway.
Those residents also can't often afford to live anywhere else, or they'd have already moved; so they're kinda of stuck in a situation that'll make their lives worse with very little they can do to remediate it themselves.