Agreed, longfinned O's just aren't that common, and should command a higher price than the usual - free. Depending on your area! Around here, Oscars are all free. Except long-fins, which are extremely rare and might cost $5.00 - $15.00 But in your area, the case might change depending on the local demand and availability. But I should add there's a shortage of healthy O's in the universe in general, and your fish is immaculate as far as care goes. Genetically, that's another story. But your fish is amazingly well-raised and that counts for a lot. If I were trying to sell him here in my area (NW Washington), I'd start asking for $20.00.