Hi MarkG,
Just in case you haven’t read it yet … post #1 here is the best place to start your research and has all the basic information, steps, and guidelines that can help you make the best choices … and avoid the worst ones (including any of the Simmons, Sealy, and Serta mattresses or any other manufacturers that won’t disclose the quality of the materials in their mattresses).
You are the second person today from Chicago and the better options in the area I’m aware of are listed in posts #2 and #4 here (which you may have seen as well). One of these … Quality Sleep / MyGreenMattress is a member here, is completely transparent about the materials in their mattress, and has among the best quality, service, and value in the country. Tim is also great to deal with.
Their latex mattresses are two sided which is a more costly construction and somewhat unusual and unlike most of the online options and the PLB mattresses as well. If I was in the Chicagoland area they would be the first and quite probably the last place I would visit.
Phoenix