Ok im not sure if this has been posted before and i think this is quite obvious to most people. But.
When you are 60 if you complete the epic mount quest for warlock or pally you will automatically get the 150 skill mount training. But because of the 1.12 patch you can buy a mount that doesnt cost over 900 gold (dont remember price but i think its around 90 g.
Again sorry if this has been posted before.