If you fly into Ohare in Chicago there is a Garrett's popcorn there. The cheese popcorn is my favorite. Before I tried their cheese popcorn, I hated it, then I tried this while at my sister-in-laws house (she lives in the Chicago area) and loved it. It really is the only reason I agree to visit the in-laws at Christmas, because I know we will go into downtown Chicago and I can buy some popcorn. I could order it online, but I don't want to open that Pandora's box, I'd probably order it all the time then! Anyway, get a bigger bag than you would normally order because it is so good, you'll be thankful later.
By the way, my husband will be in Chicago in a couple weeks and he has orders to bring back popcorn and deep dish pizza. I told him if he brings those home I will make him scotcheroos (which he loves but I only make occasionally).