If you have an Original Mattress Factory, near you, check them out.
https://www.originalmattress.com/?msclkid=6745fc3dd85017e5c773a16818c46ebb
They are double sided, and don't cost much, if any, more. If your back starts bothering you, just flip it over. Makes all the diff. We've had one since 2013 , and it's the best bed we've ever had. We have a king and flipping it is a chore, but well worth it from a comfort standpoint.