txguitar - Until you get a scale of your own, you can weigh your package at the grocery store.
Another plan is to pack a product, such as one pound of dried beans or pasta. The weight of the box plus product will be over 18 ounces.
I ship to myself so I get the product back. Just be sure you are not shipping to the same zone.
Mary Davis Nowell. Based close to Fort Worth. Shopping Interstate 20 east and west, Interstate 35 north and south.