I don't understand. The company that makes it is Kamado, which is more than likely a Japanese company (since Kamado is Japanese for hearth), but I'm not finding this product from any actual Japanese retailers. Hmmm...
There is a maker called Kamodo (makes Dragon Fire, I think), but the Big Green Egg, is made by Big Green Egg. Here is the link to their web page, which has links to the Forum.
http://www.biggreenegg.com/
The design is based on a Japanese rice cooker and soldiers brought back after WWII.
The Naked Whiz wrote a paper on the origin of the word Kamado and it is an interesting read, if you are into these cookers.
http://www.nakedwhiz.com/kamadotheword/kamadotheword.htm
BGE is definitely the big dog with Primo being a very strong second. Third place is debatable, but probably Grill Dome.
Both BGE and Primo have excellent customer service and a rabid fan base.
I have both brands and love them.