I run a small nonprofit that supports children with incarcerated parents and/or family members. We have mailing lists for the children, their families, our mentor and volunteers, churches and organization. These work well for our communications and event registration needs. Is there a way to use constant contact or a relatively inexpensive integration for donations? We currently use excel but need to better automate mailings that go to all our stakeholders. We can't justify $50+/mo for our small operation (approx 500 total recorss).