Political Wire has a post on Joe Biden's new book making the best seller list, the New York Times has it as number 15, total sales between 8000 and 15,000. The web site also mentions you can buy Promises to Keep:On Life and Politics at Amazon.
Well, best seller...? Amazon has it ranked at 8115, hardly a barn burner. As contrast, take the new book on the Duke LaCrosse case, Until Proven Innocent, by Stuart Taylor and K.C. Johnson, not even on sale yet. Amazon has it at 666.