I just realized I put the wrong weight in when I printed a prepaid label.  Can I just add stamps to the label to make up the difference, or do I have to go to the PO for a postage sticker?  I am so trying to avoid that trip.

It's ok to add your stamps to the label, Bonnie.

You can ADD stamps for extra postage. The only time you MUST physically hand over the package at a Post Office would be if it is over 13 oz and has ONLY postage stamps affixed! Mixed postage should be fine.

Thank you both for the replies.

Sorry to hijack but:

Would any of the kind post office people know a link that I can print out and give to the post office folks after they return my books with APC postage and stamps for the umpeenth time?

The only thing I can find is under New 13-ounce Mail Rule here http://www.usps.com/mailpro/2007/septoct/page4.html

Bobbi

I buy APC stamps for $2.23 all the time, and then add stamps to make the postage $2.58 or $2.93 if necessary, and it's never been a problem.

me, too, sheryl. So far, no problems.

I buy Stamps at the APC in units of $2.23, for Media Mail 1 lb. , .35 (for each add'l lb.) and .18 (for PBS Delivery Conf.), then I can wiegh the pkg and slap on the appropriate stickers at home. It's great!