Not a typo! This firm king mattress is $509 at Amazon now

Navy and white Serta Sleeptrue firm hybrid mattress with a cartoon sheep, floral pillow and navy pillow on top — (Image credit: Amazon)

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. We've found a fantastic deal, not just on a firm mattress, but on a king size so you can treat yourself to some extra space. Right now, you can save $90 on a king size Serta Sleeptrue Firm 11" Hybrid mattress at Amazon, bringing the price to just $509.15 (was $599).

Our best mattress picks of the year come with exceptional comfort, support and value for money, but rarely do we see a top-performing king size mattress drop this low in price. The Serta combines a custom Support Coil System with cooling gel memory for a comfortable night's sleep. This memory foam is structured into 3 zoned areas for maximum back support, making it a great choice for sleepers with back pain.

Serta Sleeptrue Firm 11" King Hybrid mattress
Was: $599
Now: $509.15
Saving: $89.85 at Amazon

Mattress summary: Although its an affordable mattress in a box, the Serta Sleeptrue Hybrid mattress has quality features including triple-zoned support, cooling technology and pressure relief. The three zones take care of supporting your back no matter how tall you are. Meanwhile, gel memory foam enhances heat dissipation and pressure point cradling while 800 individually wrapped coils improve airflow and durability. At 11" tall it is thick enough to suit most adult bodies, no matter your sleep positions. With 15% off in the Cyber Monday sales, a king size is now $509.15 (was $599). A king is the only size on sale right now, but we recommend you take advantage of this deal if you have the space to upgrade to a king mattress.

Price history: At MSRP, the Serta Sleeptrue Firm Hybrid is priced in line with the best cheap mattresses of the year making this Amazon discount extra sweet. 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. 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? Try this...

The WinkBed mattress: was from $1,149 $849 at WinkBed
The upper-mid-range WinkBed mattress is our best mattress for heavy people and one of our best firm mattresses of the year. It comes in four different firmness options (soft, luxury firm, firmer, plus) and is handmade to order in the USA. We recommend it to people with back pain and heavy bodies looking for a supportive sleep surface. There is $300 off the WinkBed right now, no matter the size or firmness. This offer brings a queen size luxury firm to $1,499 (was $1,799), or you can level up to a king for an extra $200.

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Eve is a sleep tech product tester and writer at Tom's Guide, covering everything from smart beds and sleep trackers, to sleep earbuds and sunrise alarm clocks. Eve is a PPA-accredited journalist with an MA in Magazine Journalism, and has four years’ experience writing features and news. In her role as Sleep Tech Product Tester and Writer for Tom's Guide, Eve is constantly trying out and reviewing the latest sleep products from brands such as Apple, Garmin, Whoop, Hatch, Sleep Number, Eight Sleep, and Oura. A fitness enthusiast who completed the London Marathon earlier this year, Eve loves exploring the relationship between good sleep, overall health, and physical performance, and how great sleep tech can make that relationship even better.