There is a very large tomato greenhouse operation in Hokkaido (7.1 ha or 17.5 acres, or 1.5 times the size of Tokyo Dome). They focus on growing them on the dry side to up the sugar brix. You can purchase a box of them at the 6, 7,8, 9, over 10% level of the momotarou. You can also buy Van Gogh tomatoes (the older name for Campari) at 7 or 8%. The higher the sugar brix the more expensive the tomato, as in over 10% sugar brix for a kilo of tomatoes delivered 5,500yen (53 C$,45US$, 58Aus$)
Pictures
http://www.natural-wonder.jp/shokai/tomato/index.html
http://www.natural-wonder.jp/kaisya/setsubi.html
http://yoshisv0.spub.chitose.ac.jp/u...i/tomato-1.jpg
http://yoshisv0.spub.chitose.ac.jp/u...i/tomato-2.jpg