Soldier Field is a venue in or near Chicago that is most often used for Soccer
They really only have little set up shops in the stadium and could really use a big team store, especially for those who want a little heat and warmth. There isn't a lot of room in the stadium so maybe that's why they don't have one.
They have the official Chicago Bears Team store right outside the stadium where you can get a lot of exclusive merchandise. Inside the stadium, they are lacking stores.