Search the following research databases to find journal articles for your commentary. Though the journals and other materials they index may overlap from one database to another, each research database indexes a high number of unique titles. Try searching all of them.
Paraphrasing from the "About" page: This database lists monographs, edited volumes, journal articles, reviews, and dictionaries, as well as YouTube-material and other internet resources. The database is a collaboration of the Bavarian State Library, the University Libraries of Augsburg, Eichstätt, and Tübingen, the Joint Library of the Hellenic & Roman Societies, the German Archaeological Institute, and the journal Gnomon: Kritische Zeitschrift für die gesamte klassische Altertumswissenschaft (Critical Journal of the Entire Field of Scholarship on Classical Antiquity).
Every student loves JSTOR. It's a full text database, which makes it easily searchable, but remember that it only indexes 40 or so scholarly journals in Classical Studies. In contrast, L'Annee Phililogique indexes over 1000 journals in Classics.
This index of scholarly materials is produced by the Modern Language Association, so it may not seem useful for research about the 1st Century, but you'd be surprised. Here are some sample article titles: "Byron's Indebtedness to Martial and Catullus" and "Martial's Epigram 10.47: Thirty-Nine English Translations to 1750."
From the website, "TOCS-IN is an entirely volunteer project, started in 1992 on the original idea of R. Morstein-Marx (Santa Barbara, California), and currently managed by PMW Matheson (Toronto, Canada) and Jacques Poucet (Louvain, Belgium). It makes available -- for searching, browsing, or downloading -- the tables of contents of about 185 journals of interest to classicists."
The "Science" in this title is a misnomer, as this database also searches materials in the humanities and the social sciences. .The scope of the database is unusually large, and it also tracks citations. If you find a good target article, be sure to click on the link to times cited, as this will direct you to other articles which have included the article in their reference list.