The lady at the post office told me to flip the box inside out because they won't accept parcel post in a priority box. The reason the post office loses money is because everybody is going paperless and loss of institutional control. Case in point my mailman was delivering mail up the street...
I just sent in my games in a priority box flipped inside out. Boxes at my post office was $1.75. I didn't use packing because the UPS guy told me to do this to my box that got shipped to Amazon so I tried it with Gazelle. I laid my games side by side and stacked so they didn't move sideways...