Not sure about Chicago but here in Texas u just call around to some sonogram technician schools and they'll let u know if they offer them or not
I'm not sure how things are in Chicago but in New York there were places that said "free ultrasound" then when you go they ask for insurance card or cash so I had to go to the ER & get one done because at the time I didn't have a doctor or insurance so that's how I got my first ultrasound done for free.