Nanny eggs are notoriously hard to ship. They are so small and so round that it's hard to stabilize them in their packaging, so any rolling breaks the veins ... and that kills the embryo. It's sad. It's probably also one of the reasons why they're disappearing.
Contact Elaine Shirley at Colonial Williamsburg, VA. She maintains a good sized flock of Nankins (although I think they're single comb.) She's hard to reach, as she has her hands full managing the heritage livestock breeds, but it's worth the wait. She is a storehouse of knowledge and has been doing this long enuogh that she may have some tricks for safe shipping. It's worth a shot!
