The very helpful Perspectives series from B&H Publishers is on sale for $2.99 each:

• Perspectives on the Sabbath
• Perspectives on the Ending of Mark
• Perspectives on Your Child’s Education
• Perspectives on Family Ministry
• Perspectives on the Doctrine of God
• Perspectives on Election
• Perspective on Children’s Spiritual Formation
• Perspectives on Church Government
• Perspectives on Christian Worship
• Perspectives on Israel and the Church
• Perspectives on Our Struggle with Sin
• Perspectives on Spirit Baptism
• Christian America?: Perspectives on Our Religious Heritage
• Perspectives on Tithing