Busenitz, Irvin A. Commentary on Joel and Obadiah. Mentor Commentaries. Geanies House, Fearn, Ross-shire, Great Britain: Mentor, 2003.
This is an accessible commentary with good judgments throughout. Busenitz holds to a seven-year eschatological day of the Lord and is premillennial. Thus, he is interested in answering some of the same questions that I have on certain of the eschatological texts in Joel. He also argues persuasively and at length for the ninth century dating of Joel.
Finley, Thomas J. Joel, Amos, Obadiah. The Wycliffe Exegetical Commentary. Chicago: Moody, 1990.
Finley goes into greater exegetical detail than Busenitz. He deals with the Hebrew text at greater length. He too is premillennial and handles the eschatological texts well. Finley holds to a post-exilic date, but I found many of his arguments were useful for my ninth century dating of the book.
Garrett, Duane A. Hosea, Joel. Vol. 19A. The New American Commentary. Nashville: Broadman & Holman Publishers, 1997.
Garrett provides a well-reasoned, careful study of Joel. He holds to a seventh-century date for the book, instead of a ninth-century date, but many of his arguments were valid and useful for supporting a seventh century date. While I would part ways with him regarding certain exegetical decisions, such as his conclusion that Joel 2 is about a historic military invasion, he is nonetheless an insightful commentator. His comments about how to understand the fulfillment of portion of Joel quoted by Peter in Acts 2 is a case in point.
Nass, Thomas P. Joel. Edited by Christopher W. Mitchell. Concordia Commentary. St. Louis, MO: Concordia Publishing House, 2023.
Thomas Nass holds strong opinions about Joel and shares them forthrightly. I found his critiques of liberal scholarship on point; identifying premillennialism with heretical scholarship was not welcome. Nass did was not informed as he should have been about premillennialism and dispensationalism given the harsh words directed toward these positions; he seemed to equate all premillennialism with older forms of dispensationalism. Nonetheless, Nass was often insightful. He also provides detailed comments on the Hebrew text.
Barker, Joel. Joel: Despair and Deliverance in the Day of the Lord. Edited by Daniel I. Block. Zondervan Exegetical Commentary on the Old Testament. Grand Rapids, MI: Zondervan, 2020.
I would need to spend more time with this commentary to give a fair evaluation, but I thought it surveyed viewpoints well in the introductory section and gave helpful comments the exegetical sections that I canvassed.