J.L.
Check out www.kidwinks.com. There's a link on the home page (front and center) for birthday party ideas. Click there, and you'll get a list of about 130 places that hold kids birthday parties in the Chicago area. Become a kidwinks member, which is free, and you can then sort that list in order of distance from your house. There's also an Events Calendar if you're looking for things to do, and a Kids Eat Free Calendar in the Restaurants section - just click on a day and find out where kids eat free or cheaply on that day.