Where can I buy a children's kimono in the greater cincinnati area?

If you can't find one in a store, try shopping online. Kimono Lily, Ryu Japan, Yamatoku, and Ichiroya all sell second-hand kimono for adults and children (REAL kimono, not satin bathrobes or kimono-inspired things). If you have the money to spend on a new one, Jshoppers.com, Rakuten, and Bokunan-do sell new kimono. Just make sure you're careful to select the appropriate kimono, since boys' and girls' styles are quite different.