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In Pictures: 35 open source and free tools to mana...
35. USPS Postage Price Calculator
The United States Postal Service also offers an online rate calculator to help you determine the cost to ship packages. You can choose a flat rate service or use the pictorial guide to choose a package shape. Enter the "to" and "from" ZIP codes to see the different rate options and the delivery service guarantee.
In Pictures: 35 open source and free tools to manage your online store