Oh, I read loads of them! Here are some of my favs:
moneysavingmom.com --not chicago specific but great info on saving money in general, and she posts her weekly meal plans which give me lots of inspiration
jillcataldo.com --chicago area grocery/drug store sales and deals
mashupmom.com --chicago area focusing on deals and sales
5dollardinners.com --not chicago specific but focuses on inexpensive meal options, also includes some sales/deal info
babycheapskate.com --baby and kid deals, great for finding out about sales at your fav stores, free shipping offers, etc. as well as sales on diapers/wipes/formula
onceamonthmom.com --it's a free meal plan site that I keep meaning to try using but haven't gotten around to, they offer several different kinds of plans based on what kind of food your family eats
Those are just a few--there are many more out there! Take a look at the blogs that these sites reference. That's how I found most of what I read--just keep following the links.