High End Kingsdown King Size Mattress for Sale List Price is $8000 Plus 2020 Model in Like New Condition Quilted with Natural Joma Wool & Silk Fibre for a luxurious comfort. BioH Gel Latex, Gel Foam, High Density Foam and Posturized BluTek Gel Visco conforms to all your curves. Tempered Micro coils and DST Accu-Support coils give you the ultimate support.