Find great bargains and great finds at National Book Store’s Warehouse Sale in SM Southmall. Get up to 80% off on books from May 2 and 3, 2014, 10 am to 9 pm, only at the Activity Center of SM Southmall, and on May 4, 2014, 10 am to 9 pm, only at the Basement Level of SM Southmall. Per DTI-NCR Permit No. 0426 Series of 2014.