Uffda, I will be having a willow tree cut down from my garden in a few weeks time. It is the upright one that has branches now slightly bending over. I am not sure whether it would be of interest or how much you might need, or if the wood should be dried (probably not) and what thicknesses you need.
I could cut branches before, for you or wait until nearer the end os Sept.
Let me know. Happy to help if it is any good.
...and those who were seen dancing were thought to be insane by those who could not hear the music.FN