You can find commercial rates for USPS shipping on their website. Here's how:

Go to the USPS website (www.usps.com) and click on the "Business" tab at the top of the page.

Under "Shipping", click on "Calculate a Price".

Enter the weight and dimensions of your package, as well as the destination zip code.

Select "Commercial Base Pricing" to view the discounted rates available to businesses.

Choose the shipping service you want to use, such as Priority Mail or First-Class Package Service, and the type of delivery (e.g. one-day, two-day, or standard).

The website will then display the shipping cost for your package based on the options you selected.

Keep in mind that USPS rates may vary based on the size and weight of your packages, as well as the shipping speed and delivery location. You may also be able to get additional discounts on USPS shipping by using an online shipping platform or by signing up for a USPS business account.