Having made a couple of attempts to get small parts out of "home made" bone, I can attest that it's not the nicest stuff to work with. I'm also a little dubious that good bone stock big enough for a fiddle peg would be easy to find. I haven't had experience with antler materials, but suspect it's more suitable, if it can be made smooth enough to not eat at the pegholes.

Just as a check, I did a brief search for imitation ivory. As expected, most returns are for purfling and binding strips, in sizes much too small for use here. ONE possible source turned up that, if not useful here might be of interest to some of our general craftspersons:

K&G Knife and Gun Finishing Supplies

At that site, I found:

Alternative Ivory, cast polyester, 1 3/8" x 4 1/2" rod at $13.75 each.

"New" Imitation Ivory, epoxy based, 1" x 1 1/2" x 5 1/2" at $20.00 each.

The sizes linked are those that looked big enough for a peg or two. The same outfit has some pretty exotic bone and horn materials, but very few things large enough for pegs. As with many web marketers, they don't say where they are; but I assume those are US dollars.

I didn't identify any "primary" sources for the materials, and the only other places I found parts big enough to chop up for pegs were bagpipe builders (size questionable, but it sounds like a good idea) and a couple of gunstock makers.

John