I’ve already stopped going to the video store, book stores, banks, and many more organizations. It’s time to stop going to the post office.
Blue boxes. If it weighs less than 1lb, you can calculate the postage online and ship it from a blue box. You’ll just need a scale and some stamps. From looking at the Rates & Fees page, it looks like you want a scale that can measure in ounce resolutions. Mail carriers don’t even pickup return mail or outgoing mail from my apartment, so you mileage might vary if you try to ship from your mail box.
Getting stamps without out going to the post office. There are about five different print-your-own postage solutions. Click-N-Ship is has no additional fees, except you will be paying for your own ink, paper and stickers. Ebay, Stamps.com, Endicia, Piney Bownes also do print-your-own postage. It costs $1.00 extra to have stamps shipped to you from USPS’s online store. It looks like you can get away with not using stickers if you print on plain paper and use tape.
Carrier pickup. Carrier pickup is free and you can schedule the pickup online. Obviously it works best if you will be in the same place for a chunk of time. Carrier pickup works for the 1 to 70lb range.