Codes are bought at physical store of Best Buy, Target or GameStop.
If I don't have stock in hand, I will make a run.
Depending on the size of the order, I may require you to agree that I mark it as paid when I leave to get the cards.
I WILL NEVER DEMAND THAT YOU RELEASE ANY FUNDS TO ME WITHOUT HAVING RECEIVED THE PRODUCT BEFOREHAND.
Marking it as paid before I drive to the store is to prevent the inconvenience of the trade being cancelled after I've invested time or money in completing it.