Hi Sleep deprived,
The list of the better options in Chicagoland is in post #2 and #4 here.
One of these is both local in Chicago and a member here and I would recommend them.
A forum search on qualitysleep or on mygreenmattress (you can just click these) will bring up much more information and feedback about them.
Quite frankly if I was in the Chicago area I wouldn’t buy any mattress either locally or online without paying them a visit and they would likely be the first … and probably the last place I would visit.
Phoenix