Casper's Black Friday sale is live now - here's how to save 10% on mattresses, sheets, and more

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• Casper is arguably the most popular mattress startup of many. And it's included in our buying guide as one of the best mattresses you can buy.
• Its most popular mattress, The Casper, has more than 40,000 reviews between those posted on Google, Amazon, and its own site, and still has a 4.8/5 rating. On a typical day, the queen size is $995.
• From November 19 through November 26, take 10% off any order with a mattress when you apply the code "COZY10" at checkout.
• To potentially save more on Black Friday and Cyber Monday, you can visit Business Insider Coupons to find up-to-date promo codes for a range of online stores, including Casper.

In the last few years, a lot of online mattress startups have popped up. They've taken out the middlemen and the accompanying costs of showrooms. As a result, the same or superior mattresses are offered for less money and hassle than the brick-and-mortar store.

Of the many startups out there, Casper may be king.

The company has become synonymous with successful online startups, and has expanded from its first mattress sale in 2014 to begin selling sheets (which we reviewed here), pillows (find our review here), and even dog beds. (you bet we had one of our dogs try the bed). It also doesn't hurt that every mattress comes with a 100-night money-back guarantee and a 10-year warranty, which is pretty much par for the course in the industry.

In other words, Casper is a grown-up cult-favorite, and the company owes a lot of that success to a really great mattress, the convenience of no-hassle home delivery, and pretty awesome prices.

On a regular day, you can get the company's best-seller, The Casper, from $595 for a twin size, and the streamlined Essential mattress from as low as $350. The upgraded high-end mattress, The Wave, comes in at $1,250 to start.

For Black Friday and Cyber Monday, you can get 10% off any order with a mattress when you apply the code "COZY10" at checkout, through November 26. So, for example, if you add a queen-size Casper Wave Mattress ($2,250) to your cart, you'll save $225 on your purchase.

If you've been meaning to get a new mattress - or bedding of any kind - now is a great time to act. Casper's prices are already low to remain competitive, and sales don't happen often.

Get 10% off any Casper order with a mattress with the code "COZY10"

If you're interested in learning more before committing to a Casper mattress, these guides will help you out:

• The best mattresses you can buy
• The best mattresses for side sleepers
• The best mattresses for back pain
• The best foam mattresses
• The best air mattresses
• The best mattress toppers
• The best mattress protectors

Looking for more deals? We've rounded up the best Black Friday and Cyber Monday deals on the internet.