Its recessive so no super form. I cant imagine how much a black axanthic would set you back at least 20k I bet.
for the regular axanthic I prefer vpi as most other people do too as they then to look better as adults then the other lines.
Prices will depend on who you go thru to get them but I wouldnt pay more then $4-500 for a visual male or female. Female hets are cheap from bhb, I think they were only $125-$150 which is very good honestly.