Default [Q - Singapore] Repair costs

So I dipped my phone into the swimming pool to take a picture. It was fine but a few hours after that, there's water in the camera lense (it's gone now) and my power button is a little broken. It needs to be pressed lots of time for it to wake up. My camera button also thinks I'm pressing it but i'm not. So it keeps activating the camera. Anyways a question to any Singaporean out there. Have any of you repaired the Z1 on any Sony store without warranty? To be more specific, to repair the buttons and the rubber in the USB flap being lose. I have repaired the USB flap on the Xperia V and it's damn expensive so I would like to know how much is it to repair the Z1.
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