To celebrate the 500th anniversary of John Calvin's birthday, Christianaudio.com has put three of their Calvin titles on sale for $2.98 each for downloads. (The fourth title from this search is a free John Piper sermon on John Calvin.)
I picked up Calvin for Armchair Theologians, and have listened to about an hour of it. The narration is excellent - very easy to follow. In fact, I may review it later in more depth, but for know, I'll settle for saying that because the fellow reading the book has an English accent, it adds a bit of gravitas to the work that I don't think is in the original.
Act quickly if you're interested. The sale only runs through July 11th.