Investing in a quality mattress can be expensive. It’s best to know when you can save the most money with a Casper promo code. Casper holds seasonal sales such as their Memorial Day Sale. You can also expect big discounts during major holidays like Black Friday, Cyber Monday, Christmas, Labor Day, New Year and the annual Casper anniversary. Casper releases limited-time 10% off coupons, 15% off promo codes, and even 20% off discount codes throughout the year.