There's a good amount of great users on here that are small breeders. Check the classifieds sections on this forum.
Expos are ok but you should ask a lot of questions to make sure that they actually hatched the snakes and aren't just simply reselling them.
Either way you choose to go, ask questions, do your research and you'll find someone you're happy with. Check the Fauna BOI (board of inquiry) to see what experiences other people had with that breeder.
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