Anyone aware of any markets that sell fresh wasabi root?

I just looked up wasabi cultivation on the internet. Doesn't seem like we have the right climate here. Maybe we up north but even then, cultivation looks quite demanding. http://www.realwasabi.com/cultivation/index.asp

Very interesting but the despite its appearance the part of wasabi that one grates is actually the stem of the plant, it grows above ground.

It has a large fibrous root system. The leaves are also edible. A wonderful plant really. It would be great to get some fresh stuff locally but the climate does not suit

cultivation of Wasabi Japonica, in Chiang Mai. Most of what gets flogged off as wasabi is just colored horseradish powder containing no wasabi at all.