Looks like Robert Gundry’s Commentry on Ephesians is free, today, only, on, Kindle, so, go, get, it….
Shouldn’t a Bible commentary clarify what God’s Word actually says? Going beyond questions of authorship, date, sources, and historicity, respected linguist and teacher Gundry offers a one-volume exposition of the New Testament that focuses on what is most useful for preaching, teaching, and individual study–what the biblical text really means. Providing interpretive observations in a “breezy” style that’s easy to read and adaptable for oral use in pulpit or classroom presentations, Gundry directs his book to an evangelical audience. His crisp translation of the New Testament inserts various phrasings of passages in brackets, allowing for smooth transition from original text to alternative and contemporary readings.
Also… It looks like his other New Testament commentaries, on Kindle, are inexpensive.