Home Slickdeals Sam’s Club – Zinus Night Therapy 13.5″ ADAPTIVE Memory Foam King Mattress... Slickdeals Sam’s Club – Zinus Night Therapy 13.5″ ADAPTIVE Memory Foam King Mattress and BiFold Box Spring Set $299.98 By ARCOM - 27 September 2019 130 0 SHARE Facebook Twitter Go to the deal page: Sam’s Club – Zinus Night Therapy 13.5″ ADAPTIVE Memory Foam King Mattress and BiFold Box Spring Set $299.98