Airfare
Two recent articles recommend ways to find the lowest airfare to your destination:
Sites that do your fare digging:
http://www.nytimes.com/2010/02/21/travel/21Prac.html
Booking a flight the frugal way:
Local Transportation
Singapore has a good public transportation system that covers most of the city. Visitors can purchase a Singapore Tourist Pass that offers unlimited rides on the MRT (Mass Rapid Transit), LRT (Light Rapid Transit), and basic bus services. For information and answers to common questions, please visit: http://www.thesingaporetouristpass.com/html/faq.php
The following website offers detailed information (and maps) on travel by rail, bus and taxi (basic rate):