Something similar actually happened to me once on another forum and to do with another hobby of mine. But I was the enquirer after the first buyer already paid for the item. I said I would gladly offer that seller 4X the amount they listed and sold their item for but they turned down the money to save their good name and integrity. They could have easily refunded the first buyer's payment but chose to stick to what they thought was right. And they really needed the money for a house payment, too. I'm lucky with this item in that it's not one of a kind; just rare. So next time, because so many people expressed interest, someone's likely to Ebay one of these or take offers instead of just ask for the amount they originally paid.
We can only hope that the seller of the cels in question learns from what happened and from now on honours the first buyer on their cels. At least they got the shipping cels out to people part right lol.
iwakuralain16 and Nelia! 
LOL
Its all good though. there are other kinda sequence mates out there for that cel so I will get one... someday. LOL She did the right thing and after the fact I could see how accepting that offer would have created problems. Thus why I was so surprised this seller even considered such a practice knowing that there may be a backlash. She did not want to correct the situation and was dead set on selling the cel to the other person which I would not be surprised if she had that motive from the beginning. Thus why it took her so long to respond to my e-mail versus other people who received replies hours before mine. 
I hope its me. LOL ...even though.... that has rarely been in the case in the past. 
haha.
Glad they are shipping their stuff(even though this is expected whenever you buy something? 
). Hopefully they have learned their lesson and set proper expectations on how they are running things in the future. 