Research by consumer experts at Which? found numerous products sold with apparently huge discounts could have been bought more cheaply at other times.
Sony's Cybershot Superzoom camera (left) was advertised as £189 with a claimed saving of £10 on Black Friday by Currys PC World but was also £10 cheaper at least 27 times before the sales event and 43 times after.
We found 26 products that were the same price or even cheaper both before and after Black Friday, so rushing out to buy them on the busy Black Friday weekend didn't have much advantage at all.
To stay on top of the latest offers, keep checking back in on this guide - we'll continue adding the best Black Friday 2018 PC Gaming deals in the days leading up to shopping holiday this November 23.
Argos said products in Black Friday deals are also included in other promotions. Is anyone surprised to hear that something might be available cheaper in the January sales than it is before Christmas has happened?
For example, an LG brand 60in 4K TV was advertised at £799 by Amazon on Black Friday.
The investigation analysed deals on the websites of Amazon, Currys PC World, Argos and John Lewis, which all heavily promote their Black Friday sales.
We've shown you every Black Friday ad that leaked in the past few weeks now and we've covered all the official sales announcements coming from various retailers.
A John Lewis spokesman said that prices are lowered throughout the year as part of its Never Knowingly Undersold commitment.
Nonetheless, the Which? study is good food for thought and a timely reminder not to go too click-happy with your bargain shopping this Black Friday.
So what's the secret?
Be careful not to impulse buy - Make sure you know the sorts of products you want to buy and how much you're prepared to spend before you start shopping in the sales.
Find out about offers in advance - sign up to your favourite retailers' newsletters for inside tips, or check their social media pages ahead of the sales for any clues or hints to what will be on offer.
Don't worry about missing out on a good offer as research has revealed that you could be better off waiting until after Black Friday anyway. Of the products listed above, all were lower in price during December and January when compared to Black Friday.
A year long Which? investigation into pricing secrets revealed the best times to buy for a range of home and technology products. This includes Amazon, which have a tonne of video games on offer at reduced prices.
Do your research - Look at the price on previous days to make sure you really are getting a good deal and don't always trust reviews you find online.