A Buc-ee's will open in Oak Creek, WI in the next few months. That is south of Milwaukee and just off of I-94 to the west. The closest one that I know of is south of Indianapolis.
Indy has a Waffle House and a Zaxby's, so the South is invading Yankeeland!
My wife and I stopped at a Buc-ee's in Georgia when we drove to Florida 3 years ago. It was large and my wife said it had the cleanest restroom that she ever saw. I saw that a 12-pack of Yuengling was $2 cheaper than at a grocery store in Deerfield Beach, FL. Maybe they get a better price for buying in bulk quantities?