Hi ashader,
Some of the better options I’m aware of in and around the Chicago area are listed in post #2 and #4 here which includes one of the members of this site (Mygreenmattress / Quality sleep) which would likely be the first (and probably the last) place I would visit locally.
A link to the list of the manufacturing members of the site that sell online and a link to a list of some of the better online memory foam options I’m aware of are in the “read first” post I linked in my last reply.
Phoenix