I honestly don't know how people price adult females.
Adult males however don't really increase in price - though proven breeders might be worth a little more.
Derek
7 adult Royals (2.5), 1.0 COS Pastel, 1.0 Enchi, 1.1 Lesser platty Royal python, 1.1 Black pastel Royal python, 0.1 Blue eyed leucistic ( Super lesser), 0.1 Piebald Royal python, 1.0 Sinaloan milk snake 1.0 crested gecko and 1 bad case of ETS. no wife, no surprise.
I would say (for basic morphs) 100-$150 added on to the hatchling price. For example, a hatchling lesser female at $200 would probably cost about 300-$350 as an adult. For more expensive morphs (clown, banana, piebald) it will probably be more.