What I did was go to two shows in a row to personally vet breeders indirectly before making purchases at the second show. Beyond online checkins, I went and saw how they kept the animals at the show, how they interacted with prospective customers, etc.
$200 probably excludes a lot of what you listed in the OP in terms of morphs, unless you somehow luck into a great deal on a pet-only (for whatever reason) animal. Some will give discounts if you follow their FB and pay for the snake before the show. So on.