There is a magic shop in Laclede's Landing near the river. If you are staying in the downtown area of St. Louis, it is walkable to the Landing.
Also, on Saturday afternoon's, local magician's from the IBM and SAM rings meet at a restaurant in the city. I can get that info and post again if you are interested.
I'm only 20 minutes away from St. Louis. If you want to meet and session, I would be happy to. I specialize in close-up cards.