i got a source a local flee market , 16 inch by 1 3/4 at widest part by 5/16 thick, nickleson brand (i think) for 50 cents each. he's got hundreds and lots of other random stuff, i have a horseshoe rasp (also 50 cents) i cant wait to use... question, did you grind your teeth at all, because ive found cracks in some that i didnt grind fairly well?