Hi jgo,
The first place I would start is the tutorial post here which has all the basic information, steps, and guidelines that can help you make the best possible choices … and know how to avoid the worst ones.
You can read some thoughts about Bowles Mattress in post #3 here and a forum search on Bowles (you can just click this) will bring up more information and feedback about them and some of their mattresses as well but I would make sure you know the details of all the layers inside any mattress you are considering because regardless of which manufacturer makes it or the name on a label … outside of how well it matches your needs and preferences in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) a mattress is only as good as its construction and the quality of the materials inside it.
If you can post all the specific layers and components of any mattress you are considering on the forum (from top to bottom) including the density of any memory foam or polyfoam and the type and blend of any latex I’d be happy to make some comments about it or help you identify any potential weak link in the mattress.
Phoenix