Seriously, I want one of these but I just can't bring myself to pay the price tag.
Mammoth Ivory D20s
For a small price of $248.00 USD, you too can own a (yes, only one) d20 die made from a tusk of an extinct Woolly Mammoth and a nice cedar and black walnut box. They will make a die for any "Land of the Lost" or Caveman games!
Here is where you can buy them (Link)
Thank goodness that they don't come in a d6 form or I would have to buy a pair for playing Tusk!
Cheers,
Sapper