Sorry to hear that... Does the vet know what is wrong with your current snake / what killed the other one? If it is some sort of virus or bacterial infection, the breeder's collection might be infected with it. It could be a condition that lays dormant for a while and then shows symptoms later.

So you purchased from a seller that had already bought the snakes from the breeder (you didn't buy directly from the breeder himself)? Just wanted to clarify my understanding of the situation. IMO, when you add multiple steps into the transaction it can complicate things. This is why I try not to buy from resellers at shows, etc.

If you fell the need, you can post in the feedback section here and give folks names so that people will know to avoid this breeder in the future.

Good luck with your snake, I hope he improves for you.