Most of us, by no hearsay, know the irresistible, arising incomprehensibly wherefrom the desire to spend a considerable and sometimes even indiscreet amount for the purchase of something on the eve of the New Year and Christmas. Still, every TV, every advertising banner promises miracles in the form of profitable prices or, at least, incredible discounts.
Arstechnica devoted to how to protect yourself from ill-advised purchases on "Black Friday". So that later it would not be painfully painful for the time and money spent without purpose.
The main goal of the sale is to force you to buy what you do not need which you would never have thought of, if not for a "profitable" price. As a rule, on sales, try to get rid of the "stale" goods. That is, the technology that people did not want to buy at normal prices.
A low-quality, non-functional, unnecessary or already obsolete product is unlikely to bring you pleasure from use after the first joy of buying is gone. That's why on sale it is sometimes better to overpay and buy goods at a lower discount, but the one you really need.
The most "profitable" offers on sale are things that are cheap in themselves. Super-budget nameless Chinese tablets at a discount can be given for delivery at a kiosk with ice cream. However, this does not mean that you must buy yourself this. Many stores still have last year's models of such devices, which apart from disappointment you will not bring anything. Among budget devices, there are quite decent options like the Nexus 7 or iPad mini of the past generation. They are even more expensive, but much better in all senses.