The Apple 85W MagSafe Power Adapter is for 15″ and 17″ MacBook Pro. Got it in Hong Kong for only HK$588 (~S$93). It is selling for S$128 in Singapore!
I am also using a 15″ MacBook Pro for work and I have a power adapter at work, it has been wired so nicely that it makes removing it very difficult and hence I decided to get a spare power adapter that allows me to bring it along when I am on call.