South Shore Furniture offers its South Shore Furniture Somea Sensation 10" or 12" Dual Firmness Mattress, with prices starting at $299. Coupon code "DN25OFFMATTRESS" drops the starting price to $224.25, as listed below. Plus, these items receive free shipping. This reversible mattress is soft on one side and firm on the other and features a removable antimicrobial jacquard cover and CertiPUR-certified high-resiliency foam.