When I bought my Sony it was out of stock everywhere but eBay. That suited me because I'm in Australia so eBay was where I wanted to find one
I would not be at all surprised to find out that the screens are where everyone is being held up. I have read enough posts from various manufacturers to wonder why someone like Amazon doesn't just buy VizPlex or at least fire a heap of cash into it in order to greatly increase production. I suspect part of the problem is that they're putting a lot of effort into improving the technology and are reluctant to invest too much in making current screens because next year they will be making different ones. I hope so, anyway.