Just in case you missed it, Logos Bible software is giving away a resource a day in celebration of Advent. The giveaways so far are:
Day 1: Scripture and the Authority of God by N. T. Wright
Day 2: Calvin's Calvinism
Day 3: 1 and 2 Timothy, Titus, Hebrews, Cornerstone Biblical Commentary by Linda Belleville, Jon Laansma, and J. Ramsey Michaels
Day 4: 11 issues of Tabletalk magazine devoted to Christian History
Day 5: A Critical and Exegetical Commentary on the Book of Esther, International Critical Commentary by Lewis Paton
You can still access all of these giveaways here.