Hi yamins,
It depends on what stock you were looking at.
A lot of the raw material is reletively cheap but then advanced trees are quite expensive. It all depends on the quality of what ever it is you are buying.
Stock that may fetch high prices in Australia (where im from) would be average stock in Japan and would be therefore priced quite cheaply. Whereas the high end trees in Japan would probably not have a market in Australia as people are not used to paying tens of thousands for a tree and therefore it would not fetch the prices they do in Japan.
I guess it all comes down to the market and availability.
Hope that helps.