We have also raced down at the Autobahn Country Club down in Joliet - it's a little playground for Chicago's rich where they have multiple tracks/courses, members can buy property/house there and have their garage on site, etc. My wife's uncle was a member when he was still alive - he raced vintage Porsche.
That one isn't nearly as expensive I don't believe. Once again though we had to do it in early spring because the good weather days are taken by the cars. The South Chicago Wheelmen club has put that one on a few times.