Try going to this site there is a gentleman who will do one lookup at at time for free, and he might do more if you let him know what you would be willing to pay.This site may also have some information to help in your search. Go to the Lookup link on the page and at the bottom of the page is the gentleman Iam talking about.

Good Luck
http://www.rootsweb.com/~ilsangam/sangamon.htm