The free Logos Book for the Month for January is the CSB Study Bible. You can also purchase the audio version, the CSB Apologetic Study Bible notes, and the Charles Spurgeon Study Bible notes for $4.99, $6.99, and $9.99 respectively. Unfortunately, I already have the free resource. In any case, you can register for a chance to win the thirteen-volume Holman Reference Collection. For all these offers, go to the Logos' Free Book of Month page here.