If you can’t wait for the official release of the iPhone 4S here in the Philippines, you can buy an unlocked (open line) unit in Greenhills.
Here are the prices for your reference:
Apple iPhone 4S 16GB – 45,000 pesos
Apple iPhone 4S 32GB – 51,000 pesos
Apple iPhone 4S 64GB – 57,000 pesos
The units are authentic, factory sealed, and comes with a 1 year store warranty.