Mattress and box spring were bought new about 18 months ago for $850. They are in very good condition. They belong to a roommate who moved out of state.
The roommate was a consultant who was travelling a lot, so the bed has been slept on for only 6 months or so.

The make is Simmons BeautyRest Studio, and this is a firm mattress.

It is still impeccably clean. Our apartment has no bedbugs and no pets either.

Here's a link to the model: http://www.warehousedirectusa.com/c=PiP3QI9QzY38RoXU9eaWzN6m1/product/SI-M55018-70-7501/Simmons-Beautyrest-Studio-Queen-Size-Mattress---Downtown---Firm.html , listed at $730 for just the mattress.

The mattress and box spring are available for pick-up in San Francisco, on Russian Hill