Common PSU brands in the Philippines include Be Quiet!, Corsair, Thermaltake, Seasonic, and FSP. Other brands are also available but most of them are not recommended in the PSU Tier List or are really pricey.
These are some that I found that are within my budget:
BeQuiet Straight Power 10 500W CM 80+ Gold - ₱4,650.00
Corsair TX550M - ₱4470.00
Seasonic Focus Gold 550FM - ₱4120.00
Cooler Master MWE Gold 650 PSU - ₱4,990.00