These special Singapore Airlines 'Take a mate' sale fares are only available when you search for and book a minimum of two passengers for any of the flights listed below. 
Select 2 adults travelling when you begin your search. 
NB. Prices shown are per person return inc. tax. Taxes subject to change.
Singapore Airlines 'Take a mate' Airfare Sale
Valid for departures 08 Apr - 20 Jul'12. Sale ends midnight 23 Jan'12
Departure   Destination Price from:
Sydney, Melbourne, Brisbane, Adelaide   Singapore   $751>>
Sydney, Melbourne, Brisbane, Adelaide   Kuala Lumpur, Penang, Langkawi, 
Kuching, Kota Kinabalu  $851>>
Sydney, Melbourne, Brisbane, Adelaide   Brunei  $830>>
Sydney, Melbourne, Brisbane, Adelaide   Bangkok, Chiang Mai,
Phuket, Koh Samui   $853>>
Sydney, Brisbane, Melbourne, Adelaide   Manila, Davao   $830>>
Sydney, Brisbane, Melbourne, Adelaide   Ho Chi Minh City, Hanoi, Da Nang    $846>>
Sydney, Brisbane, Melbourne, Adelaide   Jakarta, Denpasar, Surubaya, Medan, Palembang, Solo City, Mataram, Manado, Balikpapan, Pekanbaru    $830>>
Sydney, Brisbane, Melbourne, Adelaide   Siem Reap, Phom Penh    $855>>
Sydney, Brisbane, Melbourne, Adelaide   Yangon  $840>>
Sydney, Brisbane, Melbourne, Adelaide   Hong Kong   $822>>
Sydney, Brisbane, Melbourne, Adelaide   Taipei  $990>>
Sydney, Brisbane, Melbourne, Adelaide   Beijing, Shanghai, Guangzhou, Shenzhen, Kunming, Chongqing, Chengdu, Changsha   $1099>>
Sydney, Brisbane, Melbourne, Adelaide   Tokyo, Nagoya, Osaka, Fukuoka   $1027>>
Sydney, Brisbane, Melbourne, Adelaide   Seoul   $1004>>
update guys,
after one of member jerry mentioned about can't find the fare that quoted on this promotion, i have made comparison, seems zuji.com.au is really cheaper than travel.com.au
for 2 people might save you around $30 each and remember do your price beat with flight centre and use your $50 birthday voucher from them just realize their birthday voucher expiry date only 3 months now, not 12 months like previous voucher that i got.
it seems this fare only for up to 3 weeks travel only

 
    








What are the prices like normally? It looks like a saving of ~$200 each if you were flying with Singapore in Feb (looking at Melb->Hanoi or Melb->Tokyo)