Yeah, I've seen that. Too much. I'd go back to sesame or sunflower paste first.
I checked out that iHerbs online shop and yes you can order organic pb to Taiwan. If I order 20 jars (453g) it works out to NT217 each. Costco was NT380? for 750g. So almost the same.
The catch? According to the website Taiwanese customers have said that orders over NT3000 might be charged a 30-50% tariff.
Update: if you buy the 737g container it is cheaper per gm and so 10 jars with shipping works out to the same price per jar as Costco, And ten jars costs under NT3000 (before shipping charges which I would hope are not included in the tariff).
Hmm, maybe I will risk this.
Anyone want to go in on half?