Take up to 60% off mattresses at Sears.com. Some best bets are the pictured Serta Perfect Sleeper Queen Eurotop Mattress, which drops from $1174.99 to $469.99, a savings of 60%, and this Sealy Response Kenney Firm Queen Mattress. which drops from $699.99 to $349.99, a savings of 50%. Delivery adds $69.99 and sales tax is charged in most states.