Hello!

I came across this while doing Zither research; it's a German music store, but if one has a google translate browser extension it's easy enough to view and shop from. They have a large selection of sheet music, as well as strings, Zither rings, etc. Haven't ordered from them yet, but thought I should share! They also have a bunch of instructional books. All in German, of course, but if you're a bit handy with google translate they should still be useful, and many may contain helpful diagrams.

https://www.musikhaus-sedlmeyr.de/shop/

Tschüss!

Rory

Musikhaus Sedlmayer is awesome.
But sadly they only ship to Germany, Austria, Belgium, France and Netherlands. That's what they are actually writting in their shipping policies.
You might have to check with them via Email if they also send supplies to the US.