Scoot: Sydney-Singapore 1 way $73, Gold Coast-Singapore 1 way $62*
You'll need to be extremely flexible with your travel dates for such cheap tickets. If you are happy to fly at the specific dates for such cheap tickets, I guess you'll be in luck!
* Gold Coast - Singapore (one way) - $62 (travel 13 Jun, 2012 - 13 Jun, 2012)
* Gold Coast - Singapore (return) - $199 (travel 13 Jun, 2012 - 18 Jun, 2012)
* Sydney - Singapore (Flyfare) - $62 (travel 05 Jun, 2012 - 05 Jun, 2012)
* Sydney - Singapore (return) - $199 (travel 05 Jun, 2012 - 13 Jun, 2012)
*All advertised Scoot fares comprise the price of the air ticket, associated taxes and surcharges only and are only available online. Fares are subject to change due to currency fluctuations. Fares are for sale until sold out, and available based on market-specific outbound travel dates as per the table above. These fares are for one-way travel in economy class (unless specified otherwise), checked baggage not included. For flights from OOL and SYD to SIN, the fares are for return travel in economy class, checked baggage not included - return purchase is required. For travel originating from Gold Coast or Sydney, a credit card fee of AUD$ 6.50 per guest segment, valid as on 02 May 2012, is included in the price. Fares are for FLY fares only and do not apply for FLYBAG and FLYBAGEAT. This offer is subject to availability and confirmation. Seats are limited and may not be available on all flights or all dates. Flights are subject to regulatory approval.