There are no permanent stockists of Holga Cameras in The Philippines. In fact, outside of the company's base in Kowloon, Hong Kong, all Holga cameras appear to be bought online or in second-hand stores.
OLX, an online auction site based in The Philippines, often has Holga cameras and equipment on sale, and when I checked earlier today, there were 20 such items up for auction, mostly from sellers in the Metro Manila area.
You could of course contact the company direct, at KG Trading Company, Room 3502, Block L, Tsz Oi Court Phase III, Tsz Wan Shan, Kowloon, Hong Kong.
Other Online Options
Any online site selling second-hand cameras are likely to hold some Holga stock, given their recent popularity with photographers who enjoy working with 'low-tech' equipment. Google 'Holgamods' for example, and you will find a seller devoted to only Holga cameras. This service is based in the USA, as is the similar 'HolgaDirect'.
Before you buy, you need to know the advantages and disadvantages of using the unpredictable Holga camera! This film takes you through what to expect: