Hey, Buddha! I go to the Lil's in Megamall often as well (actually whenever i'm in megamall)! So, we may have bumped into one another but didn't know it.
Here are some of the ones i know (allan, nkm1416 and Dwight swear by JMN's in Harrison. I've been there once and it was GREAT! and they take credit cards, which is a pain because there is so much i want to buy)
Special Toys in Virramall, Quiapo, Cubao & Festival Mall
Lil'sin Park Square, Makati
JMN's Hobby Shop in Harrison Plaza
Hobbies and Comics in Makati Cinema Square
Accurate Model Works in SM Southmall
Arts supplies stores in Quiapo (plastic sheets, compressed foamboards, foliage, etc...)
More than happy to help out a fellow Filipino! Just post any questions you may have!