Good Morning America tested all the major shippers from the USPS to FedEx. What did they find? The USPS took the longest, wasn’t guaranteed, but was the cheapest. Stores offering shipping services, like Mail Boxes Etc., were a rip-off, they charged an extra $8 to $15, and tagged on “Saturday Delivery” charges and fuel costs. Best to go straight to the source. —MEGHANN MARCO