Get up to 55% off mattresses from Sealy, Serta, and more through 5/28 at JCPenney.com. Plus stack on code HOME67 during checkout for an extra 25% off. Better yet, some of the mattresses are bundled with gift card rebates. For example, this Serta iComfort Hybrid Applause II Plush Mattress & Boxspring Set drops from $2,650 to $1,570 to $1,170.50 plus this rebate gets you another $100 gift card after purchase. You'll also get free shipping on this mattress, but some models may have delivery fees. Sales tax is charged in most states.