This story was written in collaboration with Forbes Finds. Forbes Finds covers products and experiences we think you’ll love. Featured products are independently selected and linked to for your convenience. If you buy something using a link on this page, Forbes may receive a small share of that sale. Labor Day weekend is right around the corner and with it comes a fresh batch of mattress deals. You could go down to your local mattress store and be subjected to pushy salespeople, marked-up (then falsely “lowered”) prices and questionably sourced products. Or, you could pop open your favorite browser and buy these mattresses from the waning comfort of your current bed of nails.  All of the major mattress-in-a-box brands have great deals going on right now— sleep on them and you could end up writhing in a recurring nightmare of regret. Right now, Purple is offering a free set of sheets plus two free pillows with every mattress purchase. Customers can choose between the Purple Grid or classic Plush pillows. The Plush pillow is particularly clever—it has a side zipper that lets you adjust the softness of the pillow via compression. Purple’s soft, stretchy, breathable bamboo-and-span...