The Ember Mug 2 self-heating smart mug keeps your drink hot so you can stay focused without making constant trips to the microwave. And right now, Amazon, Best Buy, and Walmart are selling the 14-ounce smart mug in select colors starting at an all-time low of $89.99 ($60 off). A Verge favorite, the self-heating smart mug keeps your coffee, tea, or cocoa at the perfect temperature from the first sip to the last. Its smart sleep mode also helps conserve battery by automatically turning off the heat when the mug is empty or hasn’t been moved for a while. The Ember Mug 2 is also durable enough for everyday use, with scratch-resistant coating and an IPX7 water-resistance rating so it can safely be hand-washed.