shipping calculated by ebay is low

[bupow99]

Everytime I sell an item I oversize the package size and the weight. Each time I pay much more at USPS than ebay calculates. Im losing money because after the shipping cost and seller fees I m short money.

[jacbarcollectibles]

eBay's calculation presumes that you are purchasing your label through the eBay shipping center where you get a discount on the shipping.  Purchasing at the post office means you have to pay the retail price for the label.