Suggestion: A Walter Wink Bundle
There are only two books authored by Walter Wink currently available on Logos, "The Bible in Human Transformation: Toward a New Paradigm in Bible Study" and "Jesus and Nonviolence: A Third Way" (the latter is part of a not yet broken up collection).
However, there are quite a few other Walter Wink works, and I suggest bundling those two with the following:
The Powers That Be: Theology for a New Millennium
Naming the Powers: The Language of Power in the New Testament (Vol 1)
Unmasking the Powers (Vol 2)
Engaging the Powers: Discernment and Resistance in a World of Domination (Vol 3)
Transforming Bible Study: A Leader's Guide
The Human Being: Jesus and the Enigma of the Son of the Man
When the Powers Fall: Reconciliation in the Healing of Nations
Just Jesus: My Struggle to Become Human