They used to have a couple of stores in the south suburbs and in Lombard near Yorktown mall. If they do, then it might be tough to compete against them. There was a place on 59 one half mile north of I-88 that went out of business several years ago. I took lessons from a guy that had a shop behind the Glen theater in Glen Ellyn back when I was young.
Never saw a scuba shop in Naperville, but with Naperville and Aurora combining for over 1/4 million people, that's a lot of potential customers.