I don't know a serious Call breeder who will ship ducklings. When I have them available, I allow pickups at my home, but I never ship them. Call ducklings are fragile and they have a pretty quick metabolism...someone posted awhile back that she had ordered like 30 Call ducklings or so and they all arrived dead. I saw the picture and it will make a believer out of you. I can't see allowing that to happen to my babies that my husband and I work so hard with.
That being said, Call ducklings are tricky to hatch and raise so very few people want to sell them because they would rather grow them out and see what they have when mature, because they can command a good price and can do very well at the open or national level shows. I usually only sell them myself when I don't have room for whatever reason, or like when I am trying to get a few other people stocked with extra "seed stock" to increase the popularity and numbers of a few of the more rare varieties.