I don't know. Maybe you could try going to Rob Place. Wala ba sa SM North?
What I'm searching now online are Nick de Ocampo's books on the history of Philippine Cinema. I think he finished the second of the trilogy eh (the first one tackles the Spanish influences till the end of its conquest, then the American occupation till the 1950s, and i believe the last one--or so I heard, begins with the 1950s to the present). I think each costs around P900 - P1,000 (that's a softcover one, i don't know if they issued a hardcover).