Hi thwimsatt,
Welcome to the Mattress Forum! 
Funny you should ask. I’m currently creating a sortable database for the site business members. But until that is done, business members carrying some form of latex are listed in a reply I offered just a week ago here.
And you can also look through the online sources link for members in the post Sweet Dreams supplied. (Thanks Sweet Dreams!)
Of course, all of our business site members are listed here.
Phoenix