How to go about referrals for 3PL Fulfillment Services?

Disclaimer: I run a fulfillment center in Utah specializing in scaling small to mid-size businesses.

I'm curious how one would go about both finding referrers and compensating for a referral service? We do our own marketing and sales, but want to find unique ways to reach potential partners. The referrals would obviously be e-commerce companies looking for order fulfillment services.

Any thoughts appreciated!