A classic example is the music industry. Record companies give CDs to radio stations in hopes they’ll play certain tracks, generating interest in - and sales of - their music. Radio benefits from the free programming and giveaways.
With what company or industry can you create a similar symbiosis? Get creative. Think of other companies that share your target audience. Then, work together to build a mutually beneficial relationship. An example: if you sell cars, provide a local TV station with their news vehicles and ongoing maintenance in exchange for spots touting you as “the official automotive dealer of Channel 12.”