I've gotten lots of wood just by talking to people and telling them I make bows. I tell them about the kinds of wood I need and many people will volunteer. I also have gotten lots of wood right after a storm too. People have trees that blow over, and they are all too happy to have someone come and get it for them. Even pieces of the tree if you're like me and only have a car to haul it in. All it takes is a little sweat investment. Landscapers will sometimes let you in on wood. If all else fails ebay can be a source, though you have to be careful.