I have Noppin and Treasure Japan accounts. (Just won something off Noppin today, actually.)

This site calculates Noppin fees. If for some reason that isn't working, let me know and I can calculate them by hand.

do you think it would be better to try to buy the game from yja?
What's your other option? The exchange rate is horrible right now, so it may or may not be cheaper to buy from Y!J.