Oracles Pets

In Scholazar Basin, you need to get to Revered status with the Oracles to buy their Mysterious Egg. This egg takes a full week to hatch, but can reult in one of the following:

Tickbird Hatchling (sells for around 10-20g)
White Tickbird Hatchling (sells for around 20-30g)
Cobra Hatchling (sells for around 30-75g)
Proto-Drake Whelp (sells for 200g+)
Aged Yolk (failure) (use or vendor it)

and a rare chance at a Green Proto Drake Mount (BOP)

As soon as you hit level 76, head to scholazar and get questing through the chains to get you the ability to hatch one of these every week. Maybe you will get a lucky mount, but all in all the return on selling these is very profitable as each chance only costs you 3g.