Some good folks here: Tenkarabum
and here: 10 Colors Tenkara
Chris at Tenkarabum is likely the best source of fixed line fishing equipment in the USA. He carries at least 5 different brands of rods that I'm aware of. Running the gamut from Tenkara to microfishing, and has lately started importing very high end small stream lure rods into the USA. Going through a couple years of his blog entries would be well worth your while.
The 10 Colors Tenkara forum site seems to have taken the place of the former tenkara-fishing forum. It's sort of an odd layout, if you're used to forums organized similarly to the Campfire, but it's still fairly easy to search for information. Not all that heavily used, figure on a post a day or so, but it's still alive.
Spend some time reading and watching videos, then go hit the water. Rinse and repeat.