We just bought a new mattress for your sticks and bricks house from this company https://www.flexuscomfort.com/
We opted for a Latex Quadraflex hybrid mattress, and are very happy with it, latex should not be confused with memory foam, it is a completely different feel, much more like an innerspring mattress. It replaced a 6 year old Beautyrest Black mattress that originally sold for over twice the price. They also do custom sized mattresses, at least in the all Latex foam varieties, I will be getting one for our coach before our next trip. Not keep, but a great value for the price, though be aware the ships in 48 hours, turned into ships in 6 days, probably due to the Covid-19 situation.
p.s. One more word about Flexus, ours arrived in a Nest Mattress box with a note on it saying that it was really a Flexus, that they used to make mattresses for Nest, and were being environmentally friendly by using up the left over boxes. I did some research and it seems the standard Nest Latex Hybrid mattress is very similar to the Quadraflex I bought but uses thinner layers of mostly inferior materials than the mattress I bought, and sells for about 30% more, the big difference is they have a much flashier web site.