A few weeks ago, Oricon has released their manga ranking for the period of August 4 to August 10, 2014.
KochiKame's volume 191 sold 44,857 copies (ranked 19th) during that week. So far, and according to many websites, the volume has sold a total 45,390. As you know, the tankōbon was released on August 4, and since the ranking is between the week of August 4 to August 10, that means the book sold 533 copies before. My guess is that was sold in some places earlier, perhaps on August 3.