For international? I'm not sure I'd trust the USPS *or* the handoff to SingPost for a such a valuable item like that! Perhaps if it was sent Global Express Guaranteed, since that's an international EMS guaranteed parcel, but the weight and size limits may not be enough to cover your shipment. Even if so, Global Express Guaranteed would probably still be more than air freight on an airline. Check with any airline that serves your city pair--nearly all airlines have a cargo subsidiary. You'll have to drop it off at LAX (or possibly SNA if there is cargo service there) yourself and pick it up yourself in SIN from the cargo facility, but if it's significantly cheaper, it may be worth the savings.