Well, really depends on your professions, and the state of your Server's AH. For me, it costs me 18k to make the different Panther mounts, I will explain how. Due to me being in a level 25 guild, you get some prices off. It costs me 18k for Orb of Mystery - Item - World of Warcraft, and due to me also being a miner, I get the Gems for free. I also prospect all the Ghost Iron Ore I get, to have my chance at getting Lapis Lazuli - Item - World of Warcraft, which I get my Alchemist friend to transmute into River's Heart - Item - World of Warcraft (The Blue Panther for example). The Living Steel as well, I get the Trillium Ore, turn them into Bars then get my friend to transmute them. 1 per day, a total of 4 days to make this mount. That means 72k CHEAPEST to make this mount. But that's only in my case. They will be selling it for over 120k+ in some instances, but that is how much it costs.