I have bought from Hobby Search (1999.co.jp) and they are top knotch.
I have met the guy that does all the english orders when I was in Japan. He even showed me around one of the largest wholesalers in Tokyo and allowed me to purchase at super low prices.....
I was also one of the first people to own the new Tamiya RC Pit bag...... (It was released in Japan 4 days later.....
)