Headspace is an excellent mindfulness / meditation app... if you missed the last deal, this one's for two days only (20% coupon expires 12/29). If you're unsure you'll like the app, they have a few trial meditations available to check out.
Go to Groupon for a year subscription to Headspace at $59 : https://www.groupon.com/deals/headspace
In Promo code enter SAVE20
Total : $47.20 after savings