A 5-person very-fast flying mount in the form of a red dragon.
Not a dinky drake, mind you, but a full-sized dragon.

This is really a vehicle since it's multi-passenger.
Like the mammoth mount, you can make it produce an image of Alexstraza (in her hot elf form)
who will take care of all your shopping and repair needs.

Maybe it'll be called something like: [Eternal Gratitude of the Red Aspect]

I think I'd pay around 50,000 gold