Can someone provide me some insight on this:
Product 1: USPS flat rate box to Location A (3 pounds)= $4.90
Product 1: USPS flat rate box to Location A (Changed to 7 pounds)= $19.90
USPS website says that flat rate box rate is $11.30
Can someone explain why I am calculating 3 difference prices on a USPS Flat Rate Box
