Agreed - check with Grandmaster Pak at ISU. I don't know if they do child classes (unlikely), but his program has been around long enough to have created a large family of martial art practitioners and teachers in the area. I take Hapkido in Des Moines from a member of the Pak family of martial arts.
Grandmaster Pak is an 8th degree black belt in Taekwondo and Hapkido, and a 6th degree black belt in Judo, so he'd know a lot about all of those programs in the area (as most likely studied under him at some point!).
And I can at least say that as of 2006, the Family Martial Arts Center on Main Street was still in business. I used to live on Main Street and saw lots of young'uns in uniform running around in the evenings.