Some of the best deals and sales, however, start the following day on Dec. 26 — called Boxing Day in much of the world. A good day-after-Christmas sale can offer shoppers big-time discounts as retailers try to make room for a new year of inventory — but you have to know what to buy.
https://www.gobankingrates.com/saving-money/holiday/best-things-buy-day-after-christmas/