No one has yet pointed out the obvious: It's a corgi, the 13th most popular dog breed in the USA. Corgi puppies are super easy to get basically anywhere. Why does he need a corgi puppy from this specific breeder in Maine?
There are
8 litters in Florida with puppies for sale right now, and that's just from reputable and registered breeders. God only knows how many corgi puppies there are for sale right now in Florida from breeders that don't go through all the bother of having an AKC registration.
Also OP you say you are worried about this specific puppy. Believe me, if your friend doesn't get it there is a waiting list of people that will take the puppy because corgis are super popular.
This is a spectacularly stupid idea.
Don't traumatize a puppy by making it fly in an airplane cargo hold to get to you. I know this is common practice but it's fucking insane.
ETA: I just checked the AKC puppy finder for breeders in Maine and none of them have puppies right now. So your friend isn't even getting the puppy from a reputable breeder. This "we live in Florida but are driving to Maine to get a corgi puppy from a breeder that's not even on the AKC list" is absurd.