Art Inc. is a good read for artists and aspiring artists who want to build a sustainable business out of their creative talents and skills. I strongly recommend it as a tool to get you down to business.
After School Matters supports and empowers the young citizens of Chicago through showcasing their art creations. Check this post for some photos of their beautiful, eye-catching shop.
One of my favorite art supply store in Illinois is BLICK. They have a massive variety of supplies, kits, and collectibles available.