Beehouse teapots in San Diego
I end up seeing them everywhere, but I can't for the life of me remember exactly where!
For starters I'd try the Pannikin stores (several locations), Vitreum in Little Italy, Utsuwa-no-Yakata in the Nijiya Marketplace, the Marukai "living store" or their "100 yen store" (the latter utb Daiso), Infusions of Tea in the Costa Verde Center, Caffe Calabria in North Park, or Halcyon Tea in South Park. Better yet call first, but I'm sure at least three of these have at one time carried their line if not most...
But really it can't be that hard to find since I'm literally bumping into them all of the time!