Any magazine stores....national bookstore merun din....

Matraffic ang Gapan-Cabanatuan road....but after that halos smooth sailing na.

One alternate that really saves time is go straight to NLEX end (Sta Ines), turn right towards Concepcion, Tarlac and go to the town proper of Concepcion, Tarlac....merun road doon that would lead you to Zaragoza (just ask around the tricycle drivers)...take that road....it would lead you to a T-section. Turn right ka doon (if you turn left you'll end-up in Tarlac City) and it would get you to a town between Gapan and Cabanatuan na. Turn left and Cabanatuan is almost just 10 mins away. After Cabanatuan traffic smooth sailing ka na to Isabela.

HTH.