There are a whopping 7 commentaries to be had this month from https://logos.com/free-book-of-the-month at 80% off or greater, including the free one.
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Romans (Hendriksen & Kistemaker New Testament Commentary | HK) - FREE
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Hebrews (Understanding the Bible Commentary | UBCS) - $1.99
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1 & 2 Samuel (Teach the Text Commentary Series) - $2.99
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Psalms (Understanding the Bible Commentary | UBCS) - $3.99
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John (Hendriksen & Kistemaker New Testament Commentary | HK) - $5.99
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Ecclesiastes and Song of Songs (Teach the Text Commentary Series) - $7.99
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James and the Epistles of John (Hendriksen & Kistemaker New Testament Commentary | HK) - $9.99
There is also another free commentary, and many other good reductions also at https://verbum.com/monthly-sale#free
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Brazos Theological Commentary on the Bible: Ezra & Nehemiah - Free
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The Kingdom of God as Liturgical Empire: A Theological Commentary on 1–2 Chronicles - $1.99
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The Heart of Catholic Social Teaching: Its Origins and Contemporary Significance - $4.99
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Engaging the Doctrine of Revelation: The Mediation of the Gospel through Church and Scripture - $7.99
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Encountering the Living God in Scripture: Theological and Philosophical Principles for Interpretation - $9.99
(You can also see the Verbum books at https://www.logos.com/another-free-book if you wish to add them all to the one cart)
Also a reminder about the free book and other reduced ones at https://ebooks.faithlife.com/free-book-of-the-month
Thanks Faithlife once again (and Baker) 
