Priority Mail is in my opinion and my experience a scam. It is nothing more than a fancy envelope, a tracking number, a high price and a letter that gets no where or worse to the wrong place! Not once did they ever deliver as they promised, not one single time! Many were lost, mis-delivered, delayed etc.
If we are closing down the Government I suggest the USPS first. Let Amazon deliver mail. They seem to get 90%+ of my packages on time. Next day even. Try that at the USPS.