Here is a list of commentaries that can be borrowed at archive.org. Commentaries that are most likely to be useful for expository preaching are marked with an asterisk (*). Commentaries that make use of historical criticism are marked “Critical.” Commentaries that are evangelical and generally avoid historical criticism are marked “Evangelical.”
Romans
The Interpreter’s Bible, Volume 9: Acts, Romans (1951) (Critical)
The Letter to the Romans (Daily Study Bible) by Barclay, William (1957) (Critical)
*A Commentary on the Epistle to the Romans (Harper’s New Testament Commentaries) by Barrett, C. K. (Charles Kingsley) (1958) (Critical)
Romans, second edition (The New Century Bible) by Black, Matthew (1989) (Critical)
Invitation to the New Testament Epistles, I : a commentary on Galatians and Romans by Getty-Sullivan, Mary Ann (1982) (Critical)
Romans (Augsburg Commentary on the New Testament) by Harrisville, Roy A. (1980) (Critical)
Reading Romans: a liturgical and theological commentary by Johnson, Luke Timothy (1997) (Critical)
*The Epistle to the Romans (The New International Commentary on the New Testament) by Moo, Douglas J. (1996) (Evangelical)
Commentary on Romans by Nygren, Anders (1949) (Critical)
Galatians, Romans (Knox Preaching Guides) by Stagg, Frank (1980) (Critical)
First Corinthians
The Interpreter’s Bible, Volume 10: Corinthians, Galatians, Ephesians (1951) (Critical)
1 Corinthians, 2 Corinthians (Knox Preaching Guides) by Baird, William (1980) (Critical)
The Letters to the Corinthians (Daily Study Bible) by Barclay, William (1975) (Critical)
*A Commentary on the First Epistle to the Corinthians (Harper’s New Testament Commentaries) by Barrett, C. K. (Charles Kingsley) (1968) (Critical)
1 Corinthians : a commentary on the First Epistle to the Corinthians (Hermeneia) by Conzelmann, Hans (1975) (Critical)
*The First Epistle to the Corinthians (The New International Commentary on the New Testament) by Fee, Gordon D. (1987) (Evangelical)
First Corinthians, Second Corinthians (Collegeville Bible Commentary) by Getty-Sullivan, Mary Ann (1983) (Critical)
The First Letter of Paul to the Corinthians (The Living Word Commentary) by Holladay, Carl R. (1979) (Critical)
1 Corinthians (Abingdon New Testament Commentaries) by Horsley, Richard A. (1998) (Critical)
The First Epistle of Paul to the Corinthians : an introduction and commentary (Tyndale New Testament Commentaries) by Morris, Leon (1976) (Evangelical)
1 Corinthians (New Testament Message) by Murphy-O’Connor, J. (Jerome) (1979) (Critical)
I Corinthians : a new translation, introduction with a study of the life of Paul (The Anchor Bible) by Orr, William F.; Walther, James Arthur (1976) (Critical)
First and Second Corinthians (The New Collegeville Commentary) by Pascuzzi, Maria (2005) (Critical)
Corinthians One and Two (J. B. Phillip’s Commentaries) by Robertson, Edwin Hanton (1973) (Critical)
Reading Corinthians ; a new commentary for preachers by Talbert, Charles H. (1990) (Critical)
The First and Second Letters of Paul to the Corinthians (The Cambridge Bible Commentary) (1965) (Critical)
The First Epistle to the Corinthians by Walter, Eugen (1971) (Critical)
Second Corinthians
The Interpreter’s Bible, Volume 10: Corinthians, Galatians, Ephesians (1951) (Critical)
1 Corinthians, 2 Corinthians (Knox Preaching Guides) by Baird, William (1980) (Critical)
The Letters to the Corinthians (Daily Study Bible) by Barclay, William (1975) (Critical)
*The Second Epistles to the Corinthians (The New International Commentary on the New Testament) by Barnett, Paul N. (1997) (Evangelical)
2 Corinthians (New Testament Message) by Fallon, Francis T. (1980) (Critical)
*II Corinthians : a new translation with introduction and commentary (The Anchor Bible) by Furnish, Victor Paul (1984) (Critical) (Technical)
2 Corinthians, Galatians, Ephesians (Layman’s Bible Book Commentary) by George, David C. (1979) (Critical)
First Corinthians, Second Corinthians (Collegeville Bible Commentary) by Getty-Sullivan, Mary Ann (1983) (Critical)
Corinthians One and Two (J. B. Phillip’s Commentaries) by Robertson, Edwin Hanton (1973) (Critical)
Reading Corinthians ; a new commentary for preachers by Talbert, Charles H. (1990) (Critical)
The Second Epistle of Paul to the Corinthians : an introduction and commentary (Tyndale New Testament Commentaries) by Tasker, R. V. G. (Randolph Vincent Greenwood) (1958) (Evangelical)
*The First and Second Letters of Paul to the Corinthians (The Cambridge Bible Commentary) by Thrall, Margaret Eleanor (1965) (Critical)
2 Corinthians; a digest of reformed comment by Wilson, Geoffrey B. (1973) (Evangelical)
Galatians
The Interpreter’s Bible, Volume 10: Corinthians, Galatians, Ephesians (1951) (Critical)
The Letters to the Galatians and Ephesians (Daily Study Bible) by Barclay, William (1976) (Critical)
Galatians : a commentary on Paul’s letter to the churches in Galatia (Hermeneia) by Betz, Hans Dieter (1979) (Critical) (Technical)
Galatians : an introduction and commentary, revised edition (Tyndale New Testament Commentaries) by Cole, R. A. (R. Alan) (1989) (Evangelical)
Galatians, Ephesians, Philippians, Colossians, Philemon (The Communicator’s Commentary) by Dunnam, Maxie D. (1982) (Evangelical)
The Truth of the Gospel : an exposition of Galatians by Ebeling, Gerhard (1985) (Critical)
2 Corinthians, Galatians, Ephesians (Layman’s Bible Book Commentary) by George, David C. (1979) (Critical)
Invitation to the New Testament Epistles, I : a commentary on Galatians and Romans by Getty-Sullivan, Mary Ann (1982) (Critical)
*Galatians (The New Century Bible) by Guthrie, Donald (1981) (Evangelical)
Galatians, Philippians, Philemon, 1 Thessalonians (Augsburg Commentary on the New Testament) by Krentz, Edgar; Koenig, John; Juel, Donald H. (1985) (Critical)
*Galatians (Baker Exegetical Commentary on the New Testament) by Moo, Douglas J. (2013) (Evangelical)
The Letter of Paul to the Galatians (The Cambridge Bible Commentary) by Neil, William (1967) (Critical)
Galatians (New Testament Message) by Osiek, Carolyn (1980) (Critical)
Galatians, Romans (Knox Preaching Guides) by Stagg, Frank (1980) (Critical)
*The Message of Galatians (The Bible Speaks Today) by Stott, John R. W. (1968) (Evangelical)
Ephesians
The Interpreter’s Bible, Volume 10: Corinthians, Galatians, Ephesians (1951) (Critical)
The Letters to the Galatians and Ephesians (Daily Study Bible) by Barclay, William (1976) (Critical)
Ephesians : an introduction, translation and commentary on chapters 1-3 (The Anchor Bible) by Barth, Markus (1974) Ephesians : translation and commentary on chapters 4-6 (The Anchor Bible) by Barth, Markus (1974) (Critical) (Technical)
Paul’s Letters from Prison : Ephesians, Philippians, Colossians, Philemon (New Clarendon Bible) by Caird, George Bradford (1976) (Critical)
*The Epistles to the Colossians, to Philemon and to the Ephesians (The New International Commentary on the New Testament) by Bruce, F. F. (1984) (Evangelical)
Galatians, Ephesians, Philippians, Colossians, Philemon (The Communicator’s Commentary) by Dunnam, Maxie D. (1982) (Evangelical)
The Epistle of Paul to the Ephesians : an introduction and commentary (Tyndale New Testament Commentaries) by Foulkes, Francis (1963) (Evangelical)
2 Corinthians, Galatians, Ephesians (Layman’s Bible Book Commentary) by George, David C. (1979) (Critical)
Paul’s Letters from Prison : Philippians, Colossians, Philemon, and Ephesians (Westminster Pelican Commentaries) by Houlden, J. L. (James Leslie) (1977) (Critical)
The Letters of Paul to the Ephesians, to the Colossians and to Philemon (The Cambridge Bible Commentary) by Thompson, George Harry Packwood (1967) (Critical)
Colossians, Philemon, Ephesians (A Good News Commentary) by Patzia, Arthur G. (1984) (Evangelical)
Ephesians (New Testament Message) by Swain, Lionel (1980) (Critical)
Ephesians (Bible Study Commentary) by Vaughan, Curtis (1983) (Critical)