Serta 4-inch mattress topper: 40% off at $100

http://www.overstock.com/#/Bedding-Bath/Serta-Ultimate-4-inch-Visco-Memory-Foam-Mattress-Topper/1657609/product.html

I bought this less than a year ago-- the mattress was always covered up under a mattress protector so it's in a pristine condition. Pick up in a Palo Alto location close to campus.