Mattresses cost hundreds to thousands of dollars each, but a good deal can help make the purchase more affordable. Here are the most up-to-date deals you can find on mattresses online, including up to $400 off a Leesa mattress and $100 off any Nectar Sleep mattress. To potentially save more on your mattress, visit Business Insider Coupons to find promo codes for a range of online stores. Read more: The best mattresses Purchasing a mattress is a tough process. Doing so while balancing a budget can make the process even more difficult. Mattress companies are no strangers to discounts