You can already get a 2TB USB drive on ebay. I have 2 of them. Smaller profile than the device pictured in the article.
Word of warning buying media on Ebay.
Much of the media you buy on Ebay has much less capacity than advertised. Oh, you'll plug it in, it'll show whatever the advertised capacity is. The biggest bang for the buck right now are 64gb cards and flash drives that are in actuality just 8gb.
They reprogram the memory controller to tell you whatever they want to tell you. If you never exceed the "real" capacity, you'll never notice.
Download h2testw and run it on your devices, see if they are what you think they are. If you got it at a bargain price, chances it's not.