Some 46% of products were cheaper than their Black Friday price on at least one day during the six months afterwards.
We don't know which specific configurations of the of the will be discounted yet, but we do know is going to be taking $300 off their price for Black Friday.
Economists' predictions for the relative level of activity this Black Friday have varied.
Friday features the best revenue day of the year for retail stores according to data compiled by Womply.
Which? analysed deals at Amazon, Currys PC World, Argos and John Lewis, monitoring the prices of almost 100 popular products on offer from six months before until six months after Black Friday past year.
Meanwhile, Xbox One S bundles were reduced to £169.99, the Zing Smart X Hoverboard was reduced by £50, Acer laptops were reduced by £110, GoPros came with free accessories (worth over £100), and - cheekily - rival Amazon's own-brand products were price matched. Which? found it was cheaper on at least 60 occasions after.
An Argos spokesperson said that offering discounts on products on Black Friday did not mean those items were necessarily excluded from other promotions throughout the year. It has a Price Promise to match other stores.
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When looking at the two-week period surrounding Black Friday itself, Which? found that three-quarters (76%) of products were cheaper or the same price at other times in the year, and 74% could be picked up for the same price or less in the six months after.
The investigation analysed deals on the websites of Amazon, Currys PC World, Argos and John Lewis, which all heavily promote their Black Friday sales.
Doing a lot of research doesn't mean you have to go retailer-by-retailer to compare prices. For its part, Steam ran a single Black Friday weekend sale that lasted through Monday.
"The LG 60UJ630V, a 60" 4K TV, was advertised at £799 by Amazon on Black Friday.
"The 49" LG 49SJ810V TV was £599 on Black Friday from Currys PC World, but it was £20 cheaper from the end of December to mid-January, and again in April.
Currys PC World customers were told they could save £10 on a Sony compact camera advertised as £189 on Black Friday. It was also £10 or more cheaper at least 43 times in the six months following Black Friday, including on 33 days between December and January.