Okay, although I am not going to be listing artisans who sell art supplies, this is one exception. Handmade paper is a work of art in itself and one I hope to be attempting soon myself. And I have often looked for sources of handmade paper. It used to be hard to find, and now I am very glad to see that one of the first sources I was able to find, is still creating his handmade paper! R Lawton creates his paper and journals in Columbus, Ohio. It was not easy to decide which paper to use as an example of his work, but I hope you will go see for yourself as well:
WhiteDragonPaper
WhiteDragonPaper