Look around at some other combo morphs that are also het for albino. Base your prices on that if you want. I've seen a female pastel het albino for 350 shipped. A black pastel het albino female is going for $500. Black pastel albinos are smokin, so I think it's a fair price.

I would put a yellowbelly het albino at around 300 to 400 since you don't see them too often.

A pastel yellowbelly 100% het albino I would imagine goes for $800 or $900 shipped. I see a super pastel het albino going for $750 currently, but that means 100% of your offspring will be at least pastel ph albino which is pretty cool. A pastel YELLOWBELLY het albino is hard to come by .