Lightly Used Tempur Pedic Mattress Topper shown below in the link. Queen size. It transforms any mattress into a temper pedic memory foam feel.

I realized that I preferred the traditional spring mattress to the memory foam mattress, and therefore stopped using it, so it's been pretty lightly used.

https://www.tempurpedic.com/other-products/tempur-toppers/v/3813/

Pick up in Sunnyvale, it can definitely be transported with a sedan. But I can also drop it off near Stanford campus for $10 additional - to a total of $65.