Well Amazon’s Black Friday sale does start tomorrow, but it then goes on for the next week (or two).
Usual Amazon format is to have various things on sale for limited period per day, so they’d have you constantly looking at their site for the next week just in case…. kind of stops you looking at competitors, a good sales trick.
Counter the sales tricks with something such as hotukdeals, or just ignore it all & go down the pub instead. This is possibly the cheapest strategy depending on how much beer you can drink.
Checking the price of things over the last year is also worthwhile as you’ll find that the Black Friday price may be more than at other times of the year, such as the Spring sales in May which are often better.