Pirate Ship offers easy USPS discounts up to 87%, making it great for sellers...

https://www.bravobookmarks.win/pirate-ship-offers-usps-shipping-discounts-up-to-87-making-it-a-great-choice

Pirate Ship offers easy USPS discounts up to 87%, making it great for sellers who ship mostly with USPS. Just note, their support is email-only, which might slow you down if you need quick answers