Pirate Ship offers up to 87% off USPS rates, making it a top pick if you mainly...

https://stateofseo.com/what-does-eligible-free-accounts-mean-for-the-shippo-50-credit/

Pirate Ship offers up to 87% off USPS rates, making it a top pick if you mainly ship USPS and want great discounts. Its support is only by email, which might slow things down