RBC Ministries also has radio programs, free Christian courses, DVDs, and many other resources to enhance your life as a Christian.
I receive their free DVDs each quarter, which are broadcasts from their Day of Discovery television programs about Biblical topics. Again, the resource will be mailed to you for free, but they ask that you make a donation, if possible.
When possible, I try to send a donation as the quality and range of materials offered by RBC is wonderful.
Be sure to explore the RBC Web site for their variety of resources.