Pirate Ship is great if you want USPS labels up to 87% off and straightforward...

https://station-wiki.win/index.php/Is_Pirate_Ship_Really_Free_or_Are_There_Hidden_Label_Fees%3F

Pirate Ship is great if you want USPS labels up to 87% off and straightforward phone support. It’s perfect for sellers who ship mostly USPS. But if you need DHL Express or prefer email-only support, Shippo might be a better fit