I really can't believe that they are charging $4,000 for this so called rarity -- it is most likely a genetic defect, and not one that I would want to encourage, breed for, or be proud of ... a lot of genetic defects come in groups, and I wouldn't be surprised if this/these little guys have more wrong with them than translucent skin. There seems to be no sort of "advantage" to this trait for the chameleon, making it detrimental rather than helpful.
It is kinda cool to see a picture of though.