Chicago is a huge area. There must be dozens of places to get RAM. We have 3 or 4 Apple stores in the Chicago metro area for starters, plus big stores like MicroCenter, Fry's, and CompUSA. What Mac you have is important because each model takes a very specific type of RAM, there isn't one universal memory module for all Macs. All current Macs take industry standard RAM that isn't specific to Mac or PC, so you can find RAM at Best Buy and stores like that as well.