10% Off Sealy Mattresses + Free Shipping Free Shipping Get it at Hayneedle Check It Out The sale includes twin, queen, king, and California king sizes. Brad's Deals Editor Jim, Details Take 10% off select Sealy mattresses when you apply the code MATTRESS10 in your cart at Hayneedle. Shipping is free for orders over $49. The promotion includes this 12" Plush Tight-Top Mattress, which falls from $499 to $449.10 with the code. This 10.5" Plush Tight-Top Mattress falls from $399 to $359.10. Those are the best prices we can find anywhere, and there are many more styles to choose from in the Sealy section. Sales tax is charged in most states. Advertiser Disclosure How To Get It Use the code MATTRESS10 in your cart.