The Kindle DX never quite took off the way Amazon was intending. While a 10-inch e-reader certainly sounded good in theory -- especially for the broadsheet addicts out there -- it was too unwieldy and expensive for mass market appeal. While Amazon has continued to sell the device, and recently at a steep discount, it has been left out of every upgrade cycle since mid-2010. Now, after just three short years, it appears that Amazon has quietly killed the super-sized line. The retailer has finally removed the DX from its Kindle carousel and it's no longer listed as available direct from the company. Though, you can still pick one up from third-party sellers. We've reached out to Amazon for comment and will update if and when we hear back.