Integration with Donor tracking

[labowers]

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).