How do you buy a mount with gold in wizard 101?

They are not really popular now days but before they used to sell those a lot now they are out of the market but if you buy a game card at GameStop it comes with a mount "Rhino"which is a 2 person mount or just keep updating wizard101 to check but, now they have got out their first ever 3 person mount 3 headed dinosaur it comes with the pack " Hoard of the Hydra Pack " is a and it just costs 399 crowns.