USPS transportation surcharge will make these types of packages more expensive to ship from the post office

First-Class stamps will be spared another price hike for now, but the U.S. Postal Service will soon impose a temporary ...

The Cheapest Ways to Ship Packages

UPS and FedEx also have one-rate boxes that are similar to the USPS flat rate ones. Simple rate ground shipping for UPS runs from $10.85 for extra-small packages to $27.60 for extra-large packages ...
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USPS Says Shipping Costs Will Increase for Packages This Holiday Season. Here’s How Much They’ll Go Up

A customer wraps a USPS priority mail package with tape at the USPS Suburban post office station in Gaithersburg, Maryland, U.S., on Dec. 19, 2017. If you're planning to ship packages through the ...