Priority Mail or Express Mail? This Saturday I'll mail a flat envelope from NYC to a P.O. box in Bethesda, MD (20824); I want it to arrive by this Tuesday. Do I need to spring for Express Mail? Anecdotes welcome.
There seems to be no pattern at all re. whether Amazon ships to me via UPS or USPS. Since USPS is much, much more convenient for me, is there any way to influence this in the future? [more inside]