Pirate Ship offers great USPS discounts—up to 87% off—and strong features for...

https://shipping-discounts.s3.amazonaws.com/goshippo/video/pirateship-shipping-reviews.html

Pirate Ship offers great USPS discounts—up to 87% off—and strong features for small to mid-size sellers. But if you need DHL Express or prefer live chat support over email-only, Shippo might suit you better