I once bought a Hero account for 0.1BTC(almost a month ago). Later on I sold it for much higher price. So,there is no fixed price of any account and the price can vary substantially based on the kind of seller you get. You cannot even determine the average lf the price of the Hero/Legendary accounts. I don't know about pricing of Legendary account but, you can get a Hero account in the price range of 0.1BTC to 1.5BTC