I noticed the couple sites that had them listed for sale always say "coming soon". I don't think they ever came out. I'm surprised Kala never jumped on the Banjo-Uke bandwagon too.
Add the Kala Resonator to the Forever-Just-Around-the-Corner List with the Eleuke Steel String
I've been told from Kala they will be coming soon. Sometimes the makers want to tweak this or that and it can add time to them being available. I've got them on order.