Currently there is Promotion at RWS Site for 1 Day Pass to USS for Adults Only for MasterCard Holders for Visit till 31-May-2014. S$ 63/-.
Tickets for kids are at regular price.
Does these deals keep changing or will this be available till May-14?
If not than I would BUY it now as its from Official Site.
Other option is to look out for deals later on asiatravel.com but are for S$ 67/-
Kindly guide for necessary action.