The only way to enjoy a black Friday discount or any such discounts is to mark the prices of the goods two months or at least a month before the date. Then, check in local shops to compare the prices, on the day of discount, check to see if there's any significant decrease in the pricing. If you didn't see any, just ignore. There is this trick used by a lot of sellers of increasing the price tags of every good in a week before the Black Friday sales, or whatever they name the special shopping discount day. On that day, they'd reduce the prices. In some products, you may even see a 40% "discount", which is merely a 40% reduction of the already highly inflated price of the merchandise. But a lot of shoppers falls for this gimmick in sales 😥