Shop Now. Memory Foam or Hybrid. $399.00. Available Mattress Feels. Feel: 8" Memory Foam 10" Hybrid 10" Memory Foam 12" Hybrid 12" Memory Foam. All the comfort and trusted quality of a Sealy mattress, now conveniently packaged as a ready-to-ship mattress-in-a-box. The Sealy 8-inch Memory Foam Bed in a Box Mattress (available on Amazon and Walmart) is an affordable memory foam bed that comes direct to your door compressed and rolled into a handy box. Medium. gel memory foam that keeps you cooler; Exclusive SealyCool cover of premium breathable stretch knit fabric ; Cushion foam for a transitional layer that adapts to … NEW! Sealy LaZe Twin 12" Memory Foam Mattress-In-A-Box. Sealy are well known for their premium, quality mattresses, but did you know that they also have a cheap bed-in-a-box mattress in their range? Sealy LaZe King 12" Memory Foam Mattress-In-A-Box Sealy LaZe King 12" Memory Foam Mattress-In-A-Box 11 Non Combo Product Selling Price : 799.99 Original Price : 1099.99 List Price : 999.99 $479.99. All the comfort and trusted quality of a Sealy mattress, now conveniently packaged as a ready-to-ship mattress-in-a-box. Queen Prices Starting At: $399. Sealy Mattress-in-a-Box. Mattresses. Generous and comfortable Queen high density memory foam mattress ; SealyCool HD gel memory foam with GraphICE is a 2.5 lbs. Non Combo Product Selling Price : 479.99 Original Price : 479.99 List Price : 479.99. Sealy LaZe Twin 12" Memory Foam Mattress-In-A-Box. Size: Twin Twin Long Full Queen King CA King.