Groupon offers the NatureBright SunTouch Plus Light and Ion Therapy Lamp for $54 plus $5 for shipping. That's the lowest total price we could find by $13, although we saw it for $7 less in March. It features a 10,000-lux light and negative ion therapy unit. This device purports to alleviate symptoms associated with Seasonal Affective Disorder (SAD). Deal ends September 9.