The Martyn Lloyd-Jones Recording Trust have recently made the messages that Dr. Lloyd-Jones preached at the Hawethorne Bible Church in 1963 available for free download. Here is their summary of the history of these messages:

Martyn Lloyd-Jones preached these at the Summer Bible Conference held at Hawthorne Gospel Church, New Jersey, USA, in 1963; the week before he attended the meetings of the Sixth General Committee of the IFES. Starting with 2 clear sermons on what it means to be a Christian and why Christians continue to preach from the Bible; the series continues with important messages on assurance, evangelism and prayer. May God bless you greatly as you listen to these sermons.

Among these sermons is his well-known message on Ephesians 2:1-10, "But God..." You can find all the messages here, or you can download them below: MLJ.5771 ... What it Means to be a Christian (1 Peter 1:8) MLJ.5772 ... Assurance: Concerning the Word of God (1 Pet 1:13-25) MLJ.5773 ... Assurance: To Those Who are Slow to Believe (Luke 24:13-35) MLJ.5774 ... Assurance: To the Uncertain and to the Discouraged (Heb 4:14-16) MLJ.5775 ... Christians: Living Epistles Written by Christ (2 Cor 3:2) MLJ.5776 ... How to Get the Gospel Across (1 Thes 1:5) MLJ.5777 ... But God ... (Eph 2:1-10) MLJ.5778 ... Prayer (Acts 4)