Two questions...

I asked a guy over the phone at the Woodfield Mall Store in Schaumburg, IL if they received shipments on Sundays and he flat out said no. He said the next shipment would be in on Monday.

Check your store's status on the inventory screen on the apple site and if it shows green for the one you want...it might be worth a try. It's not always accurate though due to after store hours sales, so they could run out after the official closing time (when apple updates that site) and it would still read green for the next day even though they ran out. This happened at the Oakbrook, IL store Saturday morning for a guy over on Engadget. It shows green again tonight so I'm going to give it a shot tomorrow I think.

Only way they could have them is if they received a late shipment on Saturday that they didn't sell out of before closing.