Selecting default shipping service

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Hi.  Is there a way to select a default shipping service.  For example, today we batch shipped 50 orders and didn't realize they were all shipped out USPS priority mail, charging 8.80 average per package.  I would like the default service to me USPS frist class mail for @2.40 an average package.  I lost money today we are are in the business of making money right?  Thanks in advance for your help.