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

https://www.pop-bookmarks.win/pirate-ship-is-great-if-you-want-usps-labels-up-to-87-off-and-straightforward

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