Ember’s Smart Coffee Mug Is Back to Its Lowest Price If an Ember mug is at the top of Mom’s wish list, this sale is worth checking out. The Ember Smart Mug 2 is niche, but it has a loyal following. Even though we think there are better mug warmers on the market, Ember is like Apple AirPods or Kleenex. People want what they want. Right now, for Mother's Day, the Ember Smart Mug 2 is on sale for just under $100, a 30 percent discount and a match of the very best price we've tracked. You can save at Amazon, Best Buy, and the manufacturer's website. This smart mug is probably overkill. It has a smartphone app that notifies you when your coffee reaches the ideal temperature, and its onboard light also provides a visual indicator that your brew is ready. It intelligently adjusts power usage to keep your drink warm when you're nearby, and turns off when you're not around. The self-heating mug is on sale in a few variations—10 or 14 ounces, in blue, white, black, and purple.…