My daughter is very new to ball pythons, but in the past year she and I have learned quite a bit from this forum and my daughter has taught me quite a bit about genetics. Others will correct me if I'm wrong, but your desire for an Axanthic Pied illustrates one factor that affects pricing of Ball Pythons. That is the difference in pricing between BPs with recessive as opposed to dominant/co-dominant genes.
Axantic and Pied are both recessive genes, so in order to produce an Axanthic Pied you must breed a male with the Axanthic and Pied gene to a female with the Axanthic and Pied gene. If either the male or female is 100% Het Axanthic Pied, only 50% of the babies will be Axanthic Pied. If both the male or female are 100% Het Axanthic Pied, only 25% of the babies will be Axanthic Pied. And if both are 100% Het Axanthic and 100% Het Pied, only 6% of the babies will be Axanthic Pied.
So... you can see why a Het Axanthic BP would cost less than an Axanthic BP. One Axanthic gene vs. two Axanthic genes.
Just something to keep in mind as you're trying to make sense of BP pricing.
Hope you find what you're looking for... And check out Ultramel... they are my current favorite and there is a very pretty 2014 Ultramel on Morphmarket for $300 eating F/T rats...