I make buki for classical Japanese martial arts--those whose origins precede the Meiji period. Sometimes I have available small generic pieces, like tanto and tessen, suitable for use in gendai arts like judo or aikido, but my focus is in the specialized morphology required by various koryu arts.
I use several types of wood, but primarily a type commonly called jatoba, or Brazilian cherry. It's been shown to stand up to some pretty hard use, and it has an attractive reddish brown color, often with small bird's eyes in the grain. I've also used woods like Purpleheart and Osage Orange, but those can be difficult or nearly impossible to find in lengths suitable for weapons of bokuto size or larger.
Until the summer of 2017 buki crafting is somewhat on the back burner, as I work on finishing a degree. I also have a full-time day job, so buki has to occupy the space left after family, work, school, and my own koryu training.
If you need buki and you're training in a koryu bujutsu under a qualified instructor, send me an email and I'll see if I can help you: queries at bethsbuki dot com