While following a recommendation I stumbled to the fact that the Japanese Embroidery Center in Atlanta has a store!
Here you can purchase things like a Japanese embroidery frame which is similar to a slate frame. Flat silk. Handmade needles for goldwork. All kinds of metallic threads.
Color me impressed!
In fact, if you've never looked before, you should poke around their home website. All kinds of pretty things to look at.