The free Logos Book for the Month for June is Mark, 2nd edition (Ancient Christian Commentary on Scripture, New Testament). You can also purchase Galatians, Ephesians (Reformation Commentary on Scripture Collection, NT), James, 1-2 Peter, 1-3 John, Jude (Ancient Christian Commentary on Scripture, New Testament), and
Acts (Reformation Commentary on Scripture, NT) for $1.99, $4.99, and
$9.99 respectively. While you are at it, you can register for a
chance to win the 14 volume IVP Reference Collection. For all
these offers, go to the Logos' Free Book of Month page here.