Completely agree. Unless I'm familiar with the seller on Amazon (a known brand like Anker) I try to stick to Walmart, Target, Staples. Bonus, often times the identical item can be found at a lower price. Downside is the shipping may take a few days more.

For something like an SD card or a battery your chance of getting a counterfeit or unreliable product is pretty high. I prefer not to think too much about how that maps to food. There was an article (I think here on HN) a few years ago where a bookseller who was forced to buy Amazon ads for his own book just so the counterfeits wouldn't outrank him on Amazon.