Head over to Amazon where you can score this VALKIA Cool Mist Humidifier for just $19.79 shipped when you clip the 45% off digital coupon! This humidifier has a large 3L tank capacity which allows you to continuously use the humidifier for up to 12 hours. Plus, there’s an aroma box that you can add essential oils to the water. You can easily add water and place it back with no spill. A lot of cool humidifiers don’t and you have to have a diffuser separate for the essential oils.