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No, 'we' aren't paying for those shifted costs regardless of where we shop.

That's part of that tired mythology that we can't enact good public policy because any cost will be automatically transferred to consumers.  

That's been debunked.  It's an empty talking point invented by people trying to protect their scam.

WalMart shifts those costs to the taxpayer and pockets the profits, 

…as just one example, other stores account for those costs before taking profits, thereby absorbing those costs internally.

No, we don't all pay WalMart's cost shifting regardless of where we shop.  That's simplistic unfounded nonsense.
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There are places in the country where they have made 15 dollars an hour the base wage.  

None of the horror story fictions about raising the wage have occurred,

 …and none of the exaggerated cost transference mythology has been borne out in any documented example.