Pirate Ship gets you USPS rates up to 87% off, which is great for...

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

Pirate Ship gets you USPS rates up to 87% off, which is great for cost-conscious shippers, but their support is email-only, which can slow things down. If you need more carrier options like DHL Express or prefer faster help, Shippo might be a better fit