Be aware that some people list them under their common names- Cave Rat Snake, Cave Dwelling Rat snake, or Cavers. From what I've seen, the stripe coloration can reflect different localities. If the origin of the parent stock is known, I prefer to try to match those traits in a breeding pair and would spend more to do so. Willingness to feed, size, sex, age, numbers of available animals in the market, and temperament can all affect pricing. Typically single males are less expensive than females.
Usually when an ad is pulled, the snakes are sold. You can always contact the breeder and see if they will put you on the list for next year's offspring if they have something you really want.
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Lora