Hi joy.cheri,
I did some additional searching in the area and made some revisions to the San Luis Obispo list so it’s a little more up to date and subject to confirming that any retailer or manufacturer on the list you wish to deal with is completely transparent (see this article) and to making sure that any mattress you are considering meets the quality/value guidelines here … the better options or possibilities I’m aware of in the area are listed in post #2 here.
Phoenix