You need not visit the ant branch.
The Philippines workers mostly work in white-collar jobs in offices that means per head salary varies from 1700 at least.
Check back in a few days for things to buy with this amount and information about where exactly you can exchange currencies online and offline.
Currency rates can change after 24 hours so these rates are variable and can change anytime.
Tahweel Al Rajhi Bank exchange rates according to Open Market and Local Market Exchange center.
The best is available in every small city, also across Saudi Arabia.