What stores sell OPI?

What stores sell OPI brand nail polish? I am looking beyond Target and Meijer, my wife is looking for some special effect one and I'm trying to find it to keep us from having to spend 4 hours shopping for it on our next outing. If I can find out what stores stock it I can call them and find it for her. My wife doesn't like doing a ton of shopping even for stuff for her so if I can expedite this process so she doesn't get frustrated.