May I ask for your alternatives?
It could be useful for me too.
You do still have to watch out for marketplace items on some of them. And if it really IS direct-from-China why not go to eBay or Alibaba?
AliExpress does manage to have a search feature that is massively worse than Amazon's, if you can believe that possible.
However, I think the last purchase I made through Amazon was super specific (particular model of washing machine agitator motor) and unlikely to be glump-binned. So perhaps that's the approach.
The things in the middle are the problem.