Aiya...google other sites for it lah heheheheh... see...just like that found it.
Superior Chalet (without breakfast) S$100
Deluxe Chalet (without breakfast) S$110
Superior Chalet (without breakfast) S$125
Deluxe Chalet (without breakfast) S$135
You can't do online booking from here unless you are booking for your foreign friends as they don't allow singaporean to book it for their own use. But maybe now you know the estimated pricing you can call them to book.