Eastern/standard king boxspring foundation NEW SV-1158EKBNRetail price $442. Rebuilt boxspring box spring foundation usually 8 10 inches high, split in 2 pieces. Has brand new material around all edges, including cushion. Recycled materials inside have been stripped down, sterilized according to state regulations, then rebuilt with new materials, factory wrapped in new plastic, made in USA, locally by Sacramento Valley Mattress. CA recycling fee applies. See mattress options, discount if purchased as a set