The OP was asking about a 260g, which is still just a baby. Under a year for sure.
Pastel females going for those prices are breeder size. And I haven't seen any over $500 max for a good quality one.
For female pastels around 260g, I would say between $130-$250 depending on the quality.
Males of the same weight range from $75-$150, average to high quality respectively.
Older males don't really gain value like females.
If you go to a reptile show, many breeders have show specials.
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