I get it from native Alaskan friends. The going price ranges from $175-200 per pound for walrus. No need for a certificate when the dude hands you a tusk or tooth. I haven't ordered from bone traders but I want a gemsbok set for a long bow badly! "fossil" doesn't mean mineralized in this case, just rather old. Even the mammoth I work is not truly fossilized, more like tanned. The tundra soil is incredibly rich in tannin, the stuff that dose the work in vegetable tanning hides so preserved is really a more accurate word. There are lots of diferent kinds of ivory, many perfectly legal to sell right out of the critters mouth, hippo and warthog for example. I turn it like wood but carefully! It doesn't need more of a finish then sanding down and buffing, the stuff shines like glass on its own. Well Mammoth and walrus ivory do anyway.