Pirate Ship scores big with USPS discounts up to 87% off and easy-to-use label...

https://bizzmarkblog.com/pirate-ship-vs-shippo-for-beginners-which-is-less-confusing/

Pirate Ship scores big with USPS discounts up to 87% off and easy-to-use label printing, making it perfect for small sellers who ship mainly via USPS