We have two Nectar adjustable bed frames and memory foam mattresses (everything Twin XL size) for $350 for the pair or $200/each. The frames adjust both head and legs, have massage capabilities and lighting available underneath. They're from a non-smoking home and have been taken care of with a mattress protector (included).

You must pick them up in Menlo Park and move them yourselves, and they are available for pickup between June 16-19.

More info on frame: https://www.nectarsleep.com/bed-frames/adjustable-bed-frame
More info on mattresses: https://www.nectarsleep.com/mattress