Pre-order the new Amazon Fire TV 50" Omni Series 4K Smart TV to get it with a 22% introductory discount that brings its price to $399.99 at Amazon. These TVs will be $509.99 when they launch on 10/27, so this deal saves you $110. The Omni Series is Amazon's new premium range of 4K smart TVs. Their biggest feature is the built-in Amazon Echo that lets you control the TV and other smart home devices using Alexa commands. They can also be used for two-way video calls to other Alexa devices when you pair them with a webcam. Shipping is free. Sales tax is charged in most states.