Itoen is pretty convenient-- call their New York office, and their
matcha shows up fast!

I, too, realized that Japanese greens were on-line from Japan, and I
have used Hibiki-an and O-cha. Also like:

http://maiko.ne.jp/english/

There is a German guy who works with this company, Ralph Faerber. He
speaks great English, and it is because of him that the Maiko website
has elaborate *English* (and German) explanations going. I went to
Uji about a year ago, and he gave me a personal tour of the tea
fields, and took me to a restaurant that specializes in serving food
that uses tea as a vegetable I believe if you ever had questions
about the tea you were buying, he would be able to give very grounded
and intelligent answers.

This place is especially proud of their gyokuro, but their sencha is
good too, and I'm quite fond of their matcha. I also buy shin-cha
from them every May.

As I recall, you place the order, then they contact you by e-mail with
the shipping price, which you then pay separately. I think the prices
(even after shipping) are quite reasonable for the quality. Shipping
also seems fast.