Many of Luther's sermons (public domain) are available from the website of Our Redeemer Lutheran Church, LCMS, in Lexington, Kentucky.
Here is a DVD available.
Here is another source for Luther's sermons, devotionals, etc.
ICHABOD, THE GLORY HAS DEPARTED - explores the Age of Apostasy, predicted in 2 Thessalonians 2:3, to attack Objective Faithless Justification, Church Growth Clowns, and their ringmasters. The antidote to these poisons is trusting the efficacious Word in the Means of Grace. John 16:8. Isaiah 55:8ff. Romans 10. Most readers are WELS, LCMS, ELS, or ELCA. This blog also covers the Roman Catholic Church, Eastern Orthodoxy, and the Left-wing, National Council of Churches denominations.