I am in downtown Chicago. I know there is a shop up in Lincoln Park (Underwater Safaris), that is where MissKok got certified. I know I should get my own equipment, but 90% of my diving is while in Asia, and while traveling around islands in Thailand and Philippines. As a rule, I do not check any luggage while doing that, so that prohibits bringing my own equipment anyway.
A friend and I have talked about going diving here in Lake Michigan (the boat is no problem). Now that the water is warm, we should do it. Weekdays are MUCH better for me.