Top deals include the Celcus 32" HD Ready LED TV with Freeview, on sale for £100 instead of £180, the Dyson DC44 cordless vacuum cleaner, which is available for £190 instead of £270 and the HP 14" Jack Black notebook for £150 instead of £280.
Also going on discount is the Nutribullet - one of last year's most popular items - which is available for £65 instead of £85, the Linx 2GB 16 10" tablet, for £100 instead of £159 and the Krups Mini Me coffee machine for £45, down from £100.
Read more: How to bag an Apple bargain on Black Friday
Telly addicts can pick up a Now TV Box v2 for £15 instead of £25 and music buffs can get their hands on some Sony ZX-610 Headphones for £20 instead of £50.
Photographers can take their pick of the KitVision HD10 Action Camera, which has been discounted to £70 from £150 or the Polaroid 40x optical zoom bridge camera for £75 instead of £150.
Sainsbury's is clearly expecting its offers to go down well with bargain-hunters, reminding customers "these deals won't be around for long" - and imposing a maximum of one of item per customer.
All 24-hour Sainsbury's stores will open at 6am on Friday 27 November and other participating stores will keep their regular opening hours.
Sainsbury's stores in Bybrook, Harringey, London Colney and Lincoln will operate 24-hour opening times on Black Friday and all 481 stores will be participating in the sales bonanza this year.
To help you plan ahead, you can find all the latest deals, news and opinion on Black Friday here, and tips on how to get the best bargains, including Tesco, Ebay, Currys PC World, John Lewis and Amazon. But don't expect to find Asda among them this year, the supermarket has set a precedent and pulled out of the sales bonanza.
What is Black Friday and where did it come from? Watch the video to find out: