Isca module- please help :-(

Which is the latest edition of isca available at chapter offices. I tried to call at offices of 4 different places but was unable to connect. I have "revised addition jan 11" but after amendments in some chapters (2&5) i require new edition. But at icai's chapter office i was told that they do not sell 1 book only and i have to purchase the whole set of group 2...... Is it so ? PLEASE HELP ; IS THERE ANY FACILITY TO PLACE ORDER WITH ICAI DIRECTLY THROUGH POST OR ONLINE please please please help me i really need the book