"The End of Poverty" by Jeffrey Sachs has sold how many total books to date?

This type of detailed sales information is not released by publishers.
One can get impressionistic data (often good enough) by looking at
sales rankings (e.g. Amazon.com) where available. One can also look at
physical copies at local bookstores and examine the printing number
given on the copyright page. Of course it is, then, another exercise
to figure out how many copies were in each printing. Some of these
figures are sometimes mentioned in trade sources such as Publishers
Weekly. I've seen a 10th printing of the hardcover. It has done, and
is doing, pretty well.