Ibotta
This is a cashback app that works with some of the top retailers in North America, like Amazon and Walmart, and even regional stores, home goods retailers, and apparel shops. It works any time of the year, but most of their discounts and deals will be available during the holiday season, making this prime time to use this app. Unlike the majority of other apps, the money-saving power of Ibotta is not restricted to online purchases, as you can also take a picture of your physical receipts, and retroactively claim your reward.