Get the Thundering Serpent Hatchling pet before Draenor
This article on Warcraft Pets shows you how to get the Thundering Serpent Hatchling before it's taken away in Warlords of Draenor. I did it myself just last night and it works!
The easiest way to send your character gold to buy the pet is to mail them Revered Guild Tabards. They sell for 62 gold each. Also, your character should wear one (and any heirlooms!) to increase guild experience gained. I spent a few hours questing while watching the teevee. It was a grind, but didn't take all that very long, really!
And, of course, once you do it for one character, the pet's available for all your characters, cross-faction and everything—as illustrated below!