Those are regularly sold at very inflated prices, I have sold them many times at around $100-$150 canadian, and I was making decent money selling them at that price.
Alot of online stores have "Rare" or "Collector" areas on their sites where they sell nice fish for hugely inflated prices, making the customer think they are getting some amazingly rare fish that no one else has. Its kinda sad cuz some one can pay over $1000.00 for a fish that someone down the street from them got for under $200.00
Ive purchased fish for myself that were "On Sale" for $2500.00 US but I got them else were for $225.00 US. This was a wholesale price, but if I was selling the fish I sure wouldnt sell it for $2500