Or you know.. people could continue dungeoning. I get between 10 and 20 stacks of mana herbs a week from dungeoning my little heart out. Plus, MP10s drop like crazy in Karu normal, so I don't see how they could be overpriced in NA. I don't know if the Koreans have reached a plateau of laziness that far surpasses our own, but it won't get that bad.
I ran 3 maiz normals, and 1 each of the gargoyle pieces and got 10+ stacks of 10/30s >>;