The manager of my local PO gave me a heads up today that new postage prices are coming on September 1.

He didn't know any details, though we were discussing international letter vs parcel rates when he told me. Individual post offices apparently have no more detailed advance information than we do, but at least, if he's right, I know it's coming.

You might want to put aside time on Sep 1st to go through the fun process of updating all your postage quotes.