You just need to buy from a reputable breeder, check the vendors list and than search their name on the BOI , many even without a presence online have feedback.

It's also the word of mouth ask people you know about certain vendors.

Finally no one is gonna jeopardize their reputation online or at show for a $25 to $100 animal, it even less likely at show since the majority of vendors do those show on a regular basis.

I can give you the name of at least once vendor I can vouch for selling at that show Limey @ Royal Reptilia