I'd like that. But I know Amazon commingles inventory with third-party sellers. I'd like to be able to shop just Amazon-sold items, and Amazon-only inventory. Without that, I find the whole experience devalued significantly.
On an Amazon search results or category page, look in the options in the left column for a "Seller" section, and select "Amazon Warehouse."
That option is actually not always available for some reason (maybe if all of the options on the current page will be shipped from Amazon anyway)… but I always check it when it is and I don't want any shady sellers to be included.