You can own a D20 die carved from a 10,000-year-old wooly mammoth tusk for just $249.
From Artisan Dice:
Mammoth Ivory has some very unique characteristics hiding within its aged and flaky bark. The inner layers polish to an brilliant luster that showcase a wonderful grain in the form of a subtle cross hatch pattern, and distinctively heavy weight along with a crisp sound when rolled as a die. On top of all that, it produces one hell of a stink when worked. It's by far one of the worst smells in the shop. Enduring that pungent aroma is well worth the results though as Mammoth Ivory makes some of the best dice on the planet.