Depends which one you want:
(account needs to be 36 Months old I think)
Ethereal Ostard: 3.6mil
Ethereal horse: 3.5mil
Ethereal llama: 4mil
(account needs to be 48 Months old I think)
Ethereal Unicorn: 3.7mil
Ethereal Kirin: 3.7mil
Ethereal Ridgeback: 3.7mil
(account needs to be 60 Months old I think)
Ethereal swamp dragon: 3.9mil
Ethereal giant beetle: 3.9mil