Perhaps a good and interesting alternative to buying/getting animal bits would be creating your own item (out of wood, stone or anything else). I think if you spend time, personal energy and such to carve something yourself representing or relating to the item you'd ideally acquire, it'd work as well. It's almost a ritual on its own and that way it's really genuine. I find it more respectful (to the animal and spirit) doing this rather than going through a random person and whatnot to get an animal bit from gods-know-where (and how) (unless chance is a part of the whole thing like I know it can be with me and Raven).

That said I agree with what people have said here; I have nothing against animal parts that have been ethically/respectfully acquired and such.