Will or Cook County part of Orland Park?
Have you seen the published legal notice for the property?
If so, the legal notice should have the info for the law firm that is handling the foreclosure for the Plaintiff.
You could contact their office and ask for the amount - see what info they'll give you about the upcoming auction.

If it's in Cook County and you have the PIN, you can look up filings recorded against the property here:
http://www.ccrd.info/CCRD/il031/index.jsp

If it's in Will County, same info, but at this link:
http://www.willcountyrecorder.com/

And again, if it's in Will County, you might be able to look the sale info up here:
http://www.willcountylaw.com/sheriff_sales_calendar.php?d=20…

Keep in mind that auctions are often cancelled or postponed at the last minute - homeowners attempt to short sale, refinance, do a loan mod, and in many cases, file a last minute BK to stop the sale.

Buying at auction is tricky - it's best to consult with an attorney who has knowledge in that field to advise you of the pitfalls that can occur.