Not a typo! This Serta mattress is only $509 for a king in Amazon's Cyber Monday sale

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Firm mattresses offer a supportive sleep surface that you lay on top of rather than sink into.

And they are particularly good for back and stomach sleepers, and anyone with a heavier body weight.

Navy and white Serta Sleeptrue firm hybrid mattress with a cartoon sheep, floral pillow and navy pillow on top

The Serta combines a custom Support Coil System with cooling gel memory for a comfortable night’s sleep.

You won’t find this mattress anywhere cheaper thanAmazonright now.

The three zones take care of supporting your back no matter how tall you are.

Serta Sleeptrue Firm 11" King Hybrid mattress
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At 11" tall it is thick enough to suit most adult bodies, no matter your sleep positions.

It isn’t discounted on the manufacturer’s website at the moment and is $539.10 at Best Buy.

So, this Amazon deal is the one to bag.

The WinkBed mattress: was from $1,149 $849 at WinkBed

Plus, you’re unlikely to find another king size mattress for such a low price.

Benefits:Free shipping | 100-night trial | 10-year limited warranty

Looking for something more premium?

We recommend it to people with back pain and heavy bodies looking for a supportive sleep surface.

Serta mattress

There is $300 off the WinkBed right now, no matter the size or firmness.

A woman sits on the Siena Memory Foam Mattress with a deals label

DreamCloud mattress

A white and black mattress in a brightly lit room with pillows on top and a side table next to it

A couple sitting on a Sealy Posturepedic mattress

Tom�s Guide mattress tester lying on her side on the Saatva Classic mattress in a blue-painted bedroom

A split image featuring the Nectar Classic Memory Foam Mattress on the left and the DreamCloud Luxury Hybrid on the right, leading into the DreamCloud Luxury Hybrid vs Nectar Classic showdown

The image shows a woman sitting up in bed and clutching her shoulder in pain

The Avocado Green Mattress on a simple wooden bed frame in a bedroom, a Tom�s Guide price drop deals graphic (right)

The Tempur-Pedic Tempur-Adapt mattress on a bed frame in a bedroom, a man and his young sun sitting on top of it, smiling. A Tom�s Guide price drop deals graphic (right)