That’s incredibly common. I’ve been avoiding Amazon for about ten years, but occasionally I struggle to find something and search Amazon. It’s almost always a marketplace seller and adding their name to the search term always finds it cheaper elsewhere.
The only things I can’t buy elsewhere for cheaper are books by Amazon’s publishing thing (which aren’t available elsewhere). There are a couple of authors I’d want to read who do that. They just lose a sale from me. It’s not like I can’t live without their books.
@TheOldGuy just bought a new 3D printer (AnyCubic) and it was on sale on Amazon for $359...
Their website had it on sale for $299 still with free two day shipping