They do already offer this, but it's not free, and you have to re-label each item with your barcode, and cover up any UPC codes, if possible. The base problem

They do already offer this, but it's not free, and you have to re-label each item with your barcode, and cover up any UPC codes, if possible. The base problem is that UPC. Amazon wants to use it to identify everything, as it's already there, and easy to use. However, it's also easy to counterfeit along with the item. It would also be a significant technical challenge, as it would increase the size of Amazon's item database by at least an order of magnitude, and would increase the amount of unique bins they need to maintain in the warehouse by a lot too. They clearly need to do something, but understand why they don't want to go down the road of tagging per-vendor if they can avoid it. On more expensive items, they seem to be trying the alternative of allowing vendors that control their supply chains to also exercise control of the amazon supply chain. It's starting to hit for more prominent vendors. I can no longer sell used Canon lenses on Amazon anymore. To do so, I need approval, which consists of "At least 1 purchase invoice for products from a manufacturer or distributor, 1 letter from Canon authorizing you to sell their products". (Note, this is for selling used gear, not new, or like-new. Just normal, used camera lenses that I bought and no longer need.)