Pirate Ship offers USPS rates up to 87% off, making it a solid choice if you...

https://wiki-room.win/index.php/Is_Shippo_Still_Easy_to_Use_or_Is_It_Too_Feature_Heavy%3F

Pirate Ship offers USPS rates up to 87% off, making it a solid choice if you mostly ship domestically with USPS. Support is email-only, which might slow things down during busy times