I would not want to cull either!!! I would see if anyone has any information to help sneezing/gurgling first.
Even if he is a judge I would tell him in a kind way that the birds weren't healthy.
May I ask what breed they are??
No it's usually not typical to get them like that!!!! You should call the breeder and tell him that 225 dollar birds shouldnt be disease-ridden!
As for the sneezing you might want to get an *expert* to help you.