Sheena Vasani writes about tech news, reviews gadgets, and helps readers save money by highlighting deals and product recommendations for The Verge . Coffee is what gets many of us through the workday, and a proper smart mug can keep it hot for hours so you can maintain your focus without constantly getting up to reheat your cup. Thankfully, if you don’t own one, the 14-ounce Ember Mug 2 is now available for $97.49 ($52 off) from Amazon , Target , and Ember as part of Ember’s ongoing Mother’s Day sale. You can also buy the smaller 10-ounce model for $84.47 ($46 off) from the same retailers ( Amazon , Target , Ember ). Using the Ember app, the Mug 2 lets you set an exact drinking temperature between 120 and 145 degrees Fahrenheit, which it can maintain for up to 90 minutes or all day using the included charging coaster.…