Ember Smart Mugs are at record-low prices in Amazon's Black Friday sale

Amazon has cut Ember smart mug prices to record lows for Black Friday. The high-tech mugs have built-in heating that can keep your coffee, tea or other hot drink at your ideal preset temperature, allowing you to take your time sipping it without worrying about a lukewarm beverage. Usually $130, you can pick up the 10 oz Ember Smart Mug 2 starting at $90. One of Engadget's recommended gifts for teachers, the Ember Smart Mug 2 can keep your mug heated to anywhere between 120 and 145 degrees Fahren...