I wouldn't buy a Pastel off Petco, it's the most common morph. Save your self a few more dollars and you could get a really nice Pastel with your choice of male or female of a private breeder. Also as other people have mentioned, it could be infected with something like mites.
Is not that $80 for a Pastel at Petco is cheap. Is that $80 for a normal at Petco is WAY over priced. You are taking the wrong approach when analyzing this.