Im in Illinois too, farther south, more south central. DH and I are both teachers, so all I can say is
Some of the prices in this area are:
Gas $3.19 unleaded
Milk $3.00 per gallon (I always find it on sale around $2 though)
bread $1 (I always go to the Wonder Bread Store, so get best prices, IDK store price, over $2 Im sure)
We are in middle of buying a new house, 2200 sq feet, price aprox $135k, the property taxes range around $2400.
I dont pay much attention to all the other taxes and deductions, so cant say much about the rest.
I have lived in IL all my life too and really wish I could talk DH into leaving the state since our house sold, but he wouldnt, we both are established with our jobs and our kids have been in the same district since Kindergarten, they threw a fit when I wanted to move 15 miles away into the town DH teaches in.
Maybe when we retire...in 25+ years
