Yeah lots of “drop shipping” folks on Amazon, they buy a pallet of whatever it is from the same source as the top seller and then do some magic to get the “buy box” (the company that shows as default seller). Once they run that person out of business they are free to raise pricing until they no longer are winning the buy box again.

Amazon has also gotten bad with who it allows to sell on the site, and has been known to lump similar SKUs together, even ones from different sellers. This becomes especially troublesome when someone in the stack is selling counterfeit items.

All that is to say, pay attention to who you are buying from, and be on the lookout for counterfeit items.