I boxed up the frame I had to ship, I downsized the box to 40x22x7, and the weight came to 14lbs. The USPS online calculator gives me $25.51 via Parcel Post. So I went Friday to the PO, they tell me $107.16? The woman measured the box around both directions, then told me it measures 156" total, she added both circumference measurements together to get 156". When I complained, a manager came out and made some comment about the rates being double over 80". She apparently knew nothing about the 108" limit to ship anything via USPS. I left pretty upset, and went to another PO, the guy there measured the box the same way and came up with a total of $107.16 again. I just left with the package figuring that it's cheaper by FedEx.
I decided to call a larger PO for a rate first, I was told $25.51 going on the measurements and weight I gave above. I then called both Post Offices that I had been too and got the same $25.51 price on the phone. I went back to the first PO, and again was told $107.16 and no one had any idea who would have quoted me the lower rate.

To make a long story short,
I finally drove all the way to the main depot about an hour away and shipped the thing for the $25.51.
They couldn't understand why I had any issues at the smaller PO, the guy told me the box was no where's near the next price break, he said he could tell that by just looking at it, but after I told him about the other two PO's wanting $107.16, he took out a tape and measured it just to prove a point.
It seems the PO hires idiots here. The correct measurement is maximum length plus 'girth' or the circumference of the box in the shorter direction. In this case this box measures 100" total. Putting it in the $25.51 price bracket. Its just too bad I had to burn a half tank of gas to ship something that should have been able to be sent right from here.

That still doesn't explain how a seller can ship a box that measures 154" in true measurement for $25.67.
Do PO employees get that kind of discount?