Celestial mount problem

It doesn't appear so. When entering your card's information, though, I'd encourage you to double- and triple-check that all the information you've entered is correct. This includes the security code. Accidentally mistyping any of that information may cause the transaction to fail.

Q u o t e:
Why does it have a little percent of stock if it isn't limited time? 86% of stock left..Means it's limited.

I can assure you that stock is not limited, Sadatina. :)

For credence:

http://forums.worldofwarcraft.com/thread.html?topicId=24261190807&sid=1

Q u o t e:
As there appears to be some concerns regarding the availability of the new Celestial Steed mount, we’d like notify all players that may be interested in picking one up that this mount is not currently intended to be a limited time offer.

If these plans change at any time in the future, an announcement will be made to notify our players.