northwest burbs, I go to Perfect Brewing Supply on rt 176 east of milwaukee ave in Libertyville. Pretty good prices, close to me and best of all, haven't found anything out of stock.
Since I moved out to Des Plaines two months ago, this is where I've been going. The price on equipment is not so great, so I'm buying that all online now, but the ingredient prices are good, and they have a really good selection. Plus, being outside of C(r)ook County, the prices are just a bit lower anyways because of taxes. And I'll wait to fill my gas tank until I'm up there, saves me another $.20 a gallon.