The iPhone 3GS is being made available nationwide. Some of the stores that carry it include:
Power Mac Center
In the greater Manila area, you can find it in the following stores
Mobile World / ABC Store
The package comes with a 12 month warranty period and bundled with iOS 5. This is a really good deal because the iPhone 3GS is still considered “future proof” by Apple since it will be eligible for the new iOS 6 update.