Account trade - help me out!

Hey everybody-

I'm looking to upgrade my girlfriend's WoW account and have recently been screwed over by blizzard. I tried paying with a prepaid credit card, but it was declined (However, the transaction still went through, ouch!).
Now, I have another account that has already been upgraded, though, it does not have any game time on it. I was wondering if anybody would be willing to upgrade my girlfriend's account in return for my spare account, which has a retail key attached to it.

Thanks!