nVidia has a list of authorised distributors on their website, Link hidden: Login to view.
I would assume that most wholesalers with whom you speak are not authorised nVidia distributors, which is why they deal in the older stuff -- they don't get it from nVidia, but rather from liquidation and other secondary sources (and there's nothing wrong with that -- just saying, it explains why they don't have the latest and greatest.)
Frank