A software developer made a Chrome and Firefox extension called Knockoff that automatically hides, grays out, or filters products from sketchy brands on Amazon, which highlights just how many shady brands are on the platform and how commonly they show up on searches for basic items.
I think there are browser extensions and add-ons out there that plug in alternative storefronts you can buy from when looking up an item on Amazon, but you’d have to dig them up. I don’t recall any of the names, I just know I’ve read about them.