Hi longtimematspring,
Welcome to the Mattress Forum! … and I’m glad you found us.
The better options or possibilities I’m aware of in the Champaign/Springfield/Peoria areas (subject to making sure that any specific mattress meets the quality/value guidelines here) are listed in post #2 here.
Further away there is also an Indianapolis list in post #2 here and the Chicago list is in posts #2 and #4 here.
Phoenix