According to the Washington Times, several embassies around the world made purchases, over the course of several years, of quantities of books written by the President. The report doesn’t list the number of copies, but at around $20 apiece, you’re looking at around 3,500 copies. The Times report also pointed out that “There’s no indication the White House knew about the purchases, which overall represent just a fraction of the nearly quarter-million dollars Mr. Obama donated to charities last year and his more than $1.7 million in overall income.”