Tali and Sheep Tarsals

I want to try my hand at the ancient game of Tali, commonly known as "Throwing the Bones". The problem is that I can't find a place to purchase the knuckle bones themselves. Granted I could probably find a shepherd and get the bones, but I'd be more than willing to pay a couple bucks for some that are already cleaned and polished. I wouldn't even mind if I could find glass or ceramic ones either. So....does anyone know where I can find them?