I've yet to receive it yet but there is a seller on Aliexpress.com that sells horse and badger knots. Shipping is taking forever and haven't received the knot yet but for less than $20 US you can have one of these too. 30mm Manchurian/High Mountain Badger.
High Mountain Badger Hair knot (30/80) for Shaving Brush Making-in Shaving Brush from Beauty & Health on Aliexpress.com