Have you tried getting in touch with Sinaloa Tortillas? They're a major local manufacturer and may be able to help.
Sinaloa Tortillas
PO Box 31013, Honolulu, HI 96819
(808)833-3695
A little company PR:
A Family Wrapped Up In Work | MidWeek Feature | Midweek.com
You can also try to contact Arturo Montoya via his tortilla and hot sauce factory at
Arturo's Hot Flavors of Hawaii & HotSauceHawaii Welcome You! Tasty Tortillas To Go
They don't seem to sell taro tortillas, but I'm sure they can tell you who does. It's a friendly place.
Let me know if neither of these works.