Beyond buying a specific morph; what would i need to produce axanthic?

Also i have a shot towards these snakes

2011 female Pastel - about 1100 Grams $400.00 obo

2012 male pastel Het pied 500 Grams $ 250

Spider ball Python Male 1000 Grams $350

Any suggestions? i have a very young normal female (have to assume not het)