If you're in need of a new mattress, Prime Day is one of the perfect time's to buy a bed. Some great mattress brands on Amazon, including Casper, Dreamcloud, and Tempur, will have discounts on their best-selling models on Prime Day. It is worth stating, however, that from experience, mattresses tend to always be on sale on the brand's website. In other words, if you're due for an upgrade, and are sleeping uncomfortably, don't wait for sales events. Check out the direct-to-consumer websites for discounts on great beds all year round.