I have found that “shipped and sold by amazon” also involves a very high proportion of defective or counterfeit items.

Even with books, there are many copyright-violating counterfeits, alongside many “printed on demand” copies at horrible quality (but not advertised as such) under some kind of shady deal Amazon forced down publishers’ throats.

Unfortunately Amazon has driven many alternative vendors out of the market, so it’s sometimes hard to find things elsewhere online.