I have an aikido set (bokken, jo, and tanto) in ebony from Artha Gallery. I love them. Nice feel and look great too.
Another great place to get bokken from is KINGFISHER WOODWORKS
here in the U.S.A. They have a different feel but it's one I very much like. They are not sanded at all so the grain is open, not polished. One of our students said that when you grip one of Kingfisher's weapons, it grips you back
The hickory they use is nearly indestructible; don't use it in heavy contact with "lesser" woods or you'll break a lot of bokken