I helped a brother buy a laptop through ebay. After doing some setup, resued the shipping box that came with the laptop. So, when going to the post office, I'm thinking, priority mail, 7 lbs, the cost will probaby be about $15-$20. Instead, the cost was only $6.91
Looking at my reciept, that shows Priority Mail 3-Day, Regional Rate Box B.
I never heard of such a thing. I've always thought, Priority Mail Boxes are all flat rate. I learn something new each day.