Have you heard of the Google Ad Grants for nonprofits? https://www.google.com/nonprofits/offerings/google-ad-grants/

Ad Grants provides access to $10,000 USD of in-kind advertising every month for text ads.

As stated (verbatim) on their website, most of my nonprofit clients are eligible:

“To request a Google for Nonprofits account, you must be a nonprofit charitable organization in good standing, and meet the full eligibility requirements in your country.

Please note, some types of organizations are not eligible and will not be verified. Please confirm your organization is:

• Not a governmental entity or organization
• Not a hospital or healthcare organization
• Not a school, academic institution, or university (Google for Education offers a separate program for schools)

Whether targeted online ads are completely new to your NPO or already helping you gain support, $10,000 a month in essentially free money is huge. Take the leap that helps you learn!

UPDATE: One of my NPO clients just told me they use a firm called Nonprofit Megaphone (“they’re awesome”) to manage this Google ad grant.