Sam's Club offers its members the Night Therapy Gel Infused Memory Foam 10" Elite Queen Mattress and Smartbase Set for $379 with free shipping. (Non-members pay a $37.90 surcharge.) That's $170 off list and the lowest price we could find. It's infused with green tea, charcoal, and natural plant oil and features 2.5" of gel infused memory foam, 3" of comfort foam, and a SmartBase. Deal ends February 28.