I've a twin-size Spring Air Heritage, Contessa Eurotop mattress for sale at $150.
The mattress is 4-months old, in a very good condition and protected by mattress cover.
I bought this brand new at $300 (with receipt to prove) and am selling since I am moving away.

• Deluxe knit cover and euro pillow top designed for increased comfort
• Features the Bonnell coil, dependable and strong with fully foam encased edge for added durability and increased sleeping surface
• 5 Year manufacture limited warranty

You will need to move the mattress yourself (I can help to carry it to your car/truck). I am located at Curtner Ave., Palo Alto. Drop me an email if you are interested, I can send you the photos. Thanks!