What is the best/easiest program to use to print online postage lables?

I ship with ebay and also with amazon.com. I would like to be able to print and pay for postage online. Then schedule a pick up the following day with my local carrier. The catch is that I need to ship FIRST CLASS. Don’t refer me to a site you haven’t used. I want information from someone that actually prints postage with a program.

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