Blizzard Store Problem

Like everyone else, I am trying to order a Celestial Steed. I even figured giving Blizzard a few days to handle the demand would work in my favor if I hit a problem. Shame is, it didn't.

For the record, I've used I.E and Firefox, and hit the same results.

I will go via worldofwarcraft.com to http://us.blizzard.com/store/browse.xml?f=c:5,c:33

So far so good, I select the mount, log in via my Battlenet account.
Note: Computer asked for method of payment, despite my account already having one for WoW.

I goto check out. I enter in the CVC code.
I look it over, and place my order.

Then the following happens.

"There has been an error processing your request."
I get told to call billing who hang up on me due to the demand.

Note: Sometimes when I click back, I am told to re-enter my CVC, and other times it crash's IE.