Wow, sorry to hear that. I have only bought a case at McCabe's, and had the luthier work on something for me, but I take ukulele lessons there, and I have always found the people to be really nice and knowledgable. I'm sorry to hear that happened to you. I can vouch for Island Legends in Torrance (though I don't know if they have any Kamakas) and Island Bazaar in Huntington Beach - where I bought my Kanile'a.
I don't know how far you are willing to drive, but this Thursday I'm heading to San Diego, and on my way down, I'm doing at Uke store road trip. Island Bazaar, MomiLani's, Giacoletti's, and Blue Guitar are all planned stops. If I see a Kamaka tenor, I'll post my find so you can check it out.