If you like greek food and have a big family or are having a big event, Athenian Foods based out of Melrose Park makes Greek dishes like spanakopita and moussaka but they come in big quantities. They typical sell to retail but if you see something you want.. you can call and order to pick up. They do not have an outlet store but do sell to the public. Very good food. And some hard to find Greek dishes.
http://athenianfoods.com/portal/Address: 1814 N 15th Ave, Melrose Park, IL 60160
Phone: (708) 343-6700