I bought the mattress, spring box and protective sheet (all present in the picture below) from Sleepy's. They are really comfortable and feel heavenly for good night sleep. The protective cover is machine washable.
I paid $420 for the matt&box spring + $45 Protective sheet = $465 + Tax.
Asking price is only $340 which is negotiable. In addition to that, I will also include the frame (also in the pic).