RELATED: Tips for Last-Minute Holiday Shopping | Smart holiday shopping: Avoiding fake reviews and tricky ads"Few more days left and I've seen those lines before. The NRF reports nearly 148 million people are shopping on “Super Saturday,” the last Saturday before Christmas day. The NRF calls it the biggest shopping day of the year. Amazon said Sunday is the last day for free delivery for Prime customers, Monday is the last day one-day delivery, and Tuesday is the last day shoppers can purchase items for same day delivery. FedEx can ship overnight packages through December 23 and same day delivery through Christmas, for an extra fee.