I don't know of any good tutors in Chicago, but if you're looking for an inexpensive option, you might check on craigslist -- sometimes there are some diamonds in the rough who advertise there. I don't think that GMATix.com has been updated much lately, but that's another place you might look. And if all else fails, nearly all of the good independent tutors offer online tutoring these days, so that's always an option.
If you find somebody awesome in Chicago, let me know -- I seem to get a lot of requests for referrals there, so if there's a great tutor hiding there somewhere, I'd love to know about it.