I purchased a 32gb 3g today at Target because it was the only one they had in stock. Does anyone know the protocol for trying to exchange it for a 16gb wifi? Will I be able to do this at any retailer or at Target only? I called another store and they said that they don't know when they'll get their next shipment in and if they even had the model I wanted, they wouldn't hold it for me even though I'm exchanging it. It'll be a first-come, first-serve deal with everyone else.