However, for some categories, such as batteries or electronics, even after examining all the negative reviews and rates, I've found it impossible to get non-counterfeit products. I'm happy to go to a regional specialist in such items or even to a big-box store just to get greater confidence in a genuine item.

(&yes, don't even think about getting 18650s on Amazon. I saw someone selling boxes with a Tesla logo & brand - obvious BS. I reported it and at least did see them disappear in a week, but another popped up.)

Amazon will eventually drop you as a customer if you make it a regular thing to file returns.