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I normally print my postage via Stamps.com. I just realized that I needed to send an additional 2 books to the same person. I've already printed out the postage for her first 2 books. All for books together costs 3.55 for media mail. Since I already printed out 2.77 of postage, can I add 2 forever stamps to make up the difference?
I haven't used stamps in a long time, so please help! I'm packaging books right now.