My husband I were recently shopping for a new mattress. You see, we bought our old mattress well over 15 years ago. You could actually see and feel the indentations in the mattress where our bodies went.I was also starting to wake up feeling still and sore in the back, and I have to admit, my sleep had been suffering for quite awhile. When we researched a brand new king size mattress, we had quite a bit of sticker shock.
That's when my mother in law suggested we look into a memory foam topper. Did you know that a memory foam mattress topper can save you the huge expense of buying a brand new mattress? It's true.

 

You are speaking in dollars, but this has appeared on the UK Yahoo. You could try putting a board under your side of the mattress, or get a single topper just for your side.