Oh, my!
I was wrong. The Post Office lowered the price of the flat-rate envelopes five cents but raised the flat-rate box 35 cents... and raised the international envelopes about 50 cents.
But you know, when UPS & FedEx raise their rates, that raises the cost of everything else, too... because all the stores have to pay to get their goods delivered. Unless they have their own private fleet of trucks, like the big-box stores.