I have a list of 850 books that include theology, history, geography, archeology, commentaries, Greek and Hebrew tools etc. There are so many Christian resources and from what I understand they are authored by sound Biblical teachers (not that anyone is completely sound in their theology) . I have many of the commentaries in the concise list that is posted below.
You might look into Bible software (Logos, e-sword) as wel,l if you cannot find them on ebook or .pdf
Commentary Sets
Alford, Henry. The Greek Testament. Moody, 1958. 4 vols.
Barclay, William F. The Daily Bible Series. Rev. ed.; Westminster, 1975. 18 vols.
Bruce, F. F., ed. New International Commentary on the New Testament. Eerdmans
Calvin, John. Calvin's Commentaries. Baker, 1981. 22 vols.
Calvin’s Commentaries. ed. By David W Torrance and Thomas F. Torrance.
Eerdmans, 1972. Clendenen, E. Charles and David S. Dockery.
New American Commentary. Broadman, 1991
Gaebelein, Frank E., gen. ed. The Expositor's Bible Commentary. Zondervan, 1978.
12 vols. when complete. Harrison, R. K., ed. New International Commentary on the Old Testament.
Eerdmans, on going Hendriksen, William, and Simon J. Kistemaker.
New Testament Commentary. Baker, 1954
Henry, Matthew. Matthew Henry's Commentary on the Whole Bible. Revell, n.d. 6 vols.
Jamieson, Robert, A.R. Fausset and Brown. A Commentary, Critical, Experimental, and Practical on the Old and New Testaments. Eerdmans, 1945. 6 vols.
Keil, C. F., and F. Delitzsch. Biblical Commentary on the Old Testament. Eerdmans, 1968. 11 vols.
Lange, John Peter. Commentary on the Holy Scriptures, Critical, Doctrinal and Homiletical. Zondervan, 1960. 12 vols.
Lenski, R .C. H. Interpretation of the New Testament. Augsburg, 1943. 12 vols.
MacArthur, John. The MacArthur New Testament Commentary. Moody, 1983-.
Marshal, I Howard and W. Ward Gasqque. The New International Greek Testament. Eerdmans, 1978.
Meyer, H. A. W. Critical and Exegetical Handbook to the New Testament. Funk and Wagnals, 1884. 11 vols.
Morris, Leon, ed. Tyndale New Testament Commentaries. Various eds; InterVarsity. 20 vols plus revised volumes..
Nicoll, William Robertson. The Expositor's Greek New Testament. Eerdmans, 1970. 5 vols.
Perowne, J. J. S., gen ed. Cambridge Bible for Schools and Colleges. Cambridge, 1880-. 60 vols.
Robertson, A. T. Word Pictures in the New Testament. Broadman, 1930. 6 vols.
Vincent, Marvin R. Word Studies in the New Testament. Eerdmans, 1946. 4 vols. *Walvoord,
John F., and Roy B. Zuck. The Bible Knowledge Commentary. Victor, 1983.1983. 2 vols.
Wilson, Tom and Keith Stapley. What the Bible Teaches
Kilmarnoch, : John Richie, 1984. Old Testament 1-; New Testament 9 vols.
Wiseman, D. J., ed. The Tyndale Old Testament Commentaries. InterVarsity
Wuest, Kenneth S. Wuest's Word Studies From the Greek New Testament. Eerdmans, 1973. 3 vols.
Yeager, Randolph. O. The Renaissance New Testament. Pelican, 1986. 18 vols. 1 Timothy 2:13-14