So I sold a lot on eBay and put the shipping at 6 ounces. I know that I should just get a scale to weigh the cards, but I don't sell enough to make it worth it for me. I brought the package to the PO today and it came out to 7.1 ounces. In the past I'm pretty sure I just threw a stamp or 2 on the package that was short and it was good, but the PO was trying to charge me an extra $3.00 to make up the difference so I just took the package home. Do I need to void the label and print a new one or can I just throw a stamp or 2 on there and make it good? I went on eBay to see how voiding the label would work, but it didn't really have an option for incorrect weight. Any help would be appreciated!