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I guess you can just buy from a reputable electronics distributor such as Mouser or Digikey. They have to keep their supply chains clean due to having larger customers that would abandon them in a heartbeat if they did not.

Yes, you will pay more for an SD card from one of these places than on Amazon. But not insanely so. That is the price of assurance.

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Until someone poisons the well by returning "unused" counterfeit cards to places like Digikey, anyway. It's dirty and rotten and illegal to convert fake cards into genuine cards like this, but criminals are gonna criminal.

(My own trick is to just buy cards from one of Microcenter's house brands. Their buyers know what they're doing (Microcenter's flash memory products are both excellent and priced right), and nobody is going to bother making counterfeits of them due to a lack of broad market appeal.)

I'd be surprised if digikey didn't have checks in place to mitigate your concern, for the reasons in the above comment. Businesses would leave if they got a hint of chicanery.

Or you can buy in person from Walmart. For the volume he's probably doing, that's not as impractical as it might sound.

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