It's fun going to the post office with her, it's like being a kid again, this whole world unfolds that I never knew about. She knows all the clerk in at least 3 post offices. Handy when I actually have to mail something wierd too, she's got the boxes and packing material and can guess how much it'll cost within about 50 cents.
I sell a little on ebay and started to get to know the clerks at the PO, too, BUT I recently discovered the nearest FedEx/Kinkos location and that's how I ship boxes now---including how I'll send my Christmas boxes that will go out hopefully Monday or Tuesday at the latest.
They don't sell stamps there, though. I asked and the clerk said she gets asked that all the time. I pointed out that even grocery stores sell stamps and it would be very handy if they at Kinkos sold them.