Are you asking this because you are thinking of selling on vendors or because you are looking to buy?
If looking to sell on a vendor, I really wouldn't bother - they drop as loot on many different mobs and I would imagine there is a limited desire for them as far as player populations go. That being said, if you still had your heart set on selling them, I would package them together with sulfurous ash and sell that way.
If you are looking to buy some, I agree with Luke that you really shouldn't pay very much for them.