Here is a list of some recommended commentaries for our series in Galatians

Preaching the Word
Todd Wilson

The New American Commentary
Timothy George

Reformed Expository Commentary
Philip Graham Ryken

Exegetical Commentary on the New Testament
Thomas R. Schreiner

The New International Commentary on the New Testament
Ronald Y. K. Fung

New International Greek Testament Commentary
F. F. Bruce

Word Biblical Commentary
Richard N. Longnecker