Pirate Ship offers USPS shipping discounts up to 87% off, making it a great...

https://astro-wiki.win/index.php/Shippo_for_WooCommerce:_Does_It_Handle_Multi-Carrier_Rate_Shopping%3F

Pirate Ship offers USPS shipping discounts up to 87% off, making it a great pick if you mainly ship USPS and want easy savings. Support is email-only, which works if you don’t need quick replies