A certain retail site shows these under an item I’m watching:

eBay note: This item is out of stock

eBay note: 12% off + free postage – hurry! Your watched item is now on sale with free postage.

Out of stock, 12% off, and free postage, with free postage! How much will that cost though? Can I customise my out of stock item, or will that impact my free postage with free postage and 12% off the item that’s out of stock?