I am selling my full size memory foam mattress for $75, which is half of what I paid for it, which was half of what the previous person paid for it new (it is about 2 yrs old now). It had been from Overstock.com and is similar to this mattress (same brand I believe but it's 7-inch thick): http://www.overstock.com/Home-Garden/Comfort-Dreams-Select-A-Firmness-9-inch-Full-size-Memory-Foam-Mattress/4296037/product.html

Also, I have a nice mattress protector on it that is only a few weeks old (http://www.cleanrest.com/item/Ultra_Allergy_Blocking_Mattress_Encasement/10334). If you want it too, we can make everything an even $100

It would be available for pick up in Menlo Park (Sharon Heights) after Oct 19, though this can be flexible