Sources for Wood
Wooden Weaponry
Beth’s Buki – Beth’s work is impeccable. I’ve used her jotoba naginata, and they are truly exemplary Tenshin Bukō-ryū weaponry. She’s also made a perfectly designed Araki-ryū bokuto. Her attention to detail is exacting. You will get a weapon perfect for your specifications. However, due to a number of responsibilities, I believe that it is difficult to order koryū weaponry from her at this time.
Bokken-Shop (Germany), look like they are good craftsmen. I have not purchased anything from their site. They will be offering lignum vitae (almost surely Argentine lignum vitae, as the classic lignum is an endangered species). They use a number of woods (which you will see discussed on this site) for their equipment.
Sokolot – Here is their Etsy sales site. This group, who seem to have made their own remarkable lifestyle, centered in part around the fabrication of wooden weaponry. Among others, they fabricate weaponry from cornus mas (you may have to contact them directly), as well as hornbeam, European ash, beech and other woods.