USA, Canada / Polish people/store/restaurants in Chicago [7]

I saw someone else post this for their area and was curious what businesses are store are Polish in the Chicago area. I know there are lots of Polish people in Chicago and I would love to support the local polish businesses. I know of a couple that only speak Polish as well and I would love to be able to practice some or learn more from immersion. I would also be able to meet more Polish/Polish-Americans in the Chicago area which is a big reason why I moved to the Chicago area.

If anyone knows of good restaurants that serves traditional Polish food, or stores that sell traditional Polish items or treats I would love to know of them.

Thanks!