So far, the story appears to be that they published the book in June 2006, reprinted it in September (the "more than 20 000 sold" edition) which means that they sold 20 000 hardcover copies in three months, and now, two months after THAT reprint, here comes a new one with another 10 000 having found homes.
I'm astonished, delighted, a little awed. Merry Christmas to me! And once again - muchas gracias, Espana!