In the course of my travels i have tended to be partial to Hampton Inns - and it came to my attention that the beds found therein were more comfortable than in other chains. I looked
into the matter and found to my surprise that they sell their beds to the public! i guess others have noticed as well:
https://www.shophampton.com/product.aspx?mattress-and-box-spring
Rather pricey, though. I read somewhere that they are made by Serta.
Anyway, I was suffering bouts of lower back pain - which I concluded was due, at least in part, to the mattress I had been sleeping on. So I embarked on a search for a replacement - and finally
settled on a brand called Dream Cloud - designed specifically for side sleepers (which I am). I have had it a couple of years now, and while sleeping on it did not have immediate results, over time
it appears to have resolved the issue with my back. It cost, IIRC, around $900. I just checked and found that the same mattress can be had for $649 now - although the bedding "Sleep Bundle"
(which came with mine) adds $179 to the price. I consider it to have been definitely worth the money.
Dave