Most of the more boutique places I shop at use Shopify anyways so it's still pretty convenient.
https://promotions.newegg.com/marketplace/PDF/SBNTermsAndCon...
No reason to shop there anymore. Micro Center and B&H have been great.
To be clear, I suspect error and not malfeasance on Amazon's part. But I don't really care which it is, either.
With Amazon you may get zonked and have no way of knowing until after the fact. And seeing the other comments about Newegg, that's disappointing too. Luckily I live near more than a few Microcenters - but finding reliable, trustworthy electronics retailers is becoming harder and harder.
Micro Center is the last of the old breed of computer stores, where you could expect to go and find a strong product selection and generally knowledgeable people - I can't remember the last time I've gone anywhere else and found the sales staff able to usefully consult and advise on complex questions; by contrast, I've learned through experience that I can go into my local Micro Center with nothing but a problem description and come out with a solution that will work.
I want that to go on being the case for a long time; after all, I'm not getting any younger nor are days getting any longer, and having kids around who are, by all I can tell, well paid and fairly treated precisely to develop and apply knowledge I don't have the time or honestly the desire to obtain for myself - that's something I'm not just willing, but happy, to support.
This is not typically the case if you get a grey market lens on Amazon. It's also something you'll be told on the listing.
I can point to Amazon's policy saying that warranty must apply if you want (it's by condition guidelines.)
Amazon can't be trusted with high-ticket items, including but not limited to camera equipment. Go to B&H or Adorama, or Newegg or Micro Center for high-ticket computer parts (cf. the recent spate of GPU scams), or the like. And - preferably to any of those options - support your local small retailer, if any.