We transitioned to separate beds :-( and must sell our wonderful king sized bed.
It is a memory foam mattress with twin Springwall box springs and king frame. We bought it from a retailer that had the mattress as a warranty return so we got an excellent deal. Otherwise we could not have afforded it as it was originally sold for ~$5,000! Ready to go: mattress, box springs and frame. Will consider letting the sheets, pillows etc go as well.