>>130208136he has a coupon for an item to give him a tiny amount of money off of it
the item is out of stock in that specific store, likely because other people also had coupons and used them, leading to running out of stock
the store manager can't just magic some products into the store on the same day if they run out, he has to wait for head office distribution to send more (probably the next day or day after)
Kelly is acting as if this is a great injustice to HIM PERSONALLY and the manager is evil and lazy for letting this happen