Keyclub, Soma, Electrical. Maybe Soundlab.
E-mail the cats at Flameshovel, I believe they got some contacts for small
analog/digital studios. Seriously, walk into the "pro audio"/keyboard department
at the Sam Ash in Villa Park (main/roosevelt, I believe), you'd be surprised to find out what a couple of the random employees
own at home (specific to this Sam Ash only, and I wish I remembered specific names).
And, seriously, don't be afraid to contact CRC. If the material is short, you could
book a four hour session in the wee hours of the morning, name a price, see what happens. You'll need a couple hours to let the Tape machine "normal out" after calibrating it.
Also, most any mid to small-level studio in Chicago, won't be booked out.
Contact someone, tell them what you need to do, tell them you won't need a house engineer; chances are, you'll be able to sway them down on the price scale.