Hey Pat,
USPS is not a shipping carrier as selected like UPS. However you can configure the Standard Actinic Shipping calculator to work like usps shipping. It is very easy to set up priority and express mail as classes and configure two zones (east & west). Then use USPS tool to calculate weights of items in each zone and apply the weight / cost to the Actinic configuration. I have set up usps for many sites using this method and it works great. If you need more help send me an email.
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