As a matter of fact, there is! Headliner offers a referral program that would allow you to get free time on Pro for every person that signs up for Headliner using your referral link. You can read more about that here.
And, for qualifying members of education or 501(c)(3) organizations, you can get upgraded to our Edu/Nonprofit tier for free by filling out this form. We typically review our Education/501(c)3 applications every Friday.