Letter to an Atheist apparently continues to find more on line distribution.
You can buy it online at Cokesbury Books, the retail arm of United Methodist Publishers.
And finally, it's landed on the Barnes and Noble online site. It's reached the high rank of 367,000 there !
Not sure how my book made it to Barnes and Noble, while RC Metcalf and Joel McDurmon's equally good responses to Sam Harris did not.