This large and comfortable cali king mattress was only bought 2 months ago and mildly used - it had a protective cover over it the whole time (see in pic). It's priced to sell and negotiable, it was bought for 700USD and the protective cover was 50USD. Needs to be picked up in San Jose.

Specs:
https://www.mattressfirm.com/tulo/liv-mattress/mfi130217.html