The "Stormtooper Print" option is currently selectable for any order made within the SM online shop. It just wasn't removed after the offer it related to had finished. It's not a huge problem if people select it by accident, as the orders are processed manually and it will be corrected at that point.
Edit: I have just checked and it has been removed now
Thanks for the quick reply. I had actually selected it deliberately as there was no indication in the SM online shop that the option was no longer available. So to clarify, this delivery option was never for this event ?