Far better to buy a single high quality, stable blank or machined fingerboard than to get 10 mediocre for the same price. All ebony is in serious decline and what only a few years ago was considered mediocre grade is often what is in the better grade piles today. Choose a reputable supplier like International Violin or MET Music and get a good grade. Cheap, offcut, unseasoned ebony might as well be old white bread covered with shoe polish....it will hold up about as well over the long haul. There is nothing like saving $100 on materials only to have the thing warp all over five weeks after you spent a lot of time rebuilding everything....