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Personally I use Pirate Ship for any shipments after I use up the free postage credit I get each month. That 55 cents covers credit insurance as well, so it can be worth it for some.
To be clear, Standard members get one fee-free postage printing per month. You still pay the postage, just not the 55-cent fee. (The site pays Encicia's fee for you.) Limited members get one fee-free postage printer per quarter.