Hi Sharon,
There are not a lot of great choices right in Sacramento that I’m aware of but there are some within reasonable driving distance. they are listed in post #5 here.
There are several on this list that carry latex/innerspring hybrids (besides Berkeley Ergonomics) and a few calls asking “do you carry or make any innerspring mattresses with latex comfort layers” should give you a good sense of where to go. Patrick at Community mattress also makes a basic two sided solid innerspring mattress which only has about 1/2" of polyfoam on each side which he specifically designs to add a topper of your choosing as a comfort layer which may also be a good option.
Diamond mattress also makes several models like this (such as their Ethos Hybrid line for example that some of the retailers near you may carry).
Hope this helps.
Phoenix