Oddly enough I'm going through the same search for Nakhon after having it with the Kombu 1 at Umami last week. I went to BevMo and an asian market near my house to no avail. Did you ever call Natilapa? I was thinking that maybe Whole Foods might have it. I looked up City Beer Store and their website doesn't list it. AHHHHHH, Why must this beer be so hard to find, haha.
City Beer Store
1168 Folsom St, San Francisco, CA 94103