not sure if there's anyone who posted or know this trick but just sharing a bit over here.
1) Get a priest who's able to do Mind Control
2) Go to Netherwing Ledge, Shadowmoon Valley
3) Find a NPC named "Drake Dealer Hurlunk" @ 65, 85
4) Have your priest friend mind control the NPC
5) Talk to the Mind Controlled NPC n purchase the mount
you're able to do this to get mount from the opposite faction as well.