Typically, a standard roll of 220 labels will last on average about 6 months. You can purchase additional rolls of paper from your local office supply store. Or, you can order additional rolls from an online retailer. 

Dymo Label SKU: 30323

Label Dimensions: 2-1/8" x 4"

For reliable printing, the Dymo brand is recommended using the following link: http://www.dymo.com/en-US/lw-shipping-labels-2-1-8-in-x-4-in