well... it's not the ONLY way

You can always
buy a few books of stamps, weigh your little package, and then stamp it!
That's what i do. sometimes I have to 'over-stamp', and I'm sure I've sent out a few labled "postage due", but it saves me the gas, time, hassle... and that's a biggie. I go to the actual PO every couple weeks, just to make sure I'm doing it right, or if I have one I'm not sure about. OH.. and to
buy more stamps!

My poor postman... yesterday I crammed my box FULL of outgoing boxes. I think I had 8 or 9 stuffed in there!