I bought my mattress about 20 years ago (probably new forms of life evolving in it by now), one of those memory foam overlays gave it a new lease on life for about AU$200. Very comfortable. That and a down pillow and I'm hard pressed to leave bed at times.
Essentially just looks like some plastic foam, whether it's worth that price I couldn't say.
Essentially just looks like some plastic foam, whether it's worth that price I couldn't say.