Amazon used to be the place you bought from without effort. "Of course Amazon's going to give me the best item for the best price" was the ubiquitous mindset.
Now the Amazon brand name is garbage (to me). Their prices are so mercurial you can't rely on them being even "average" and odds are they're even predatory (since it's just some random guy setting his selling price, not amazon nor MSRP).
"Fool and His Money" capitalism rules the Amazon Marketplace.
It's the worst part of eBay without the low expectations and transparency.