Here ya go:
Yamaha Music Asia
Plaza Singapura Branch
68 Orchard Road #06-01 Plaza Singapura
Singapore 238839
Tel: (65) 63363311
Fax: (65) 63363787
Mondays to Fridays: 12pm to 9pm
Saturdays to Sundays: 10am to 9pm
Public Holidays: 12pm to 9pm
I reckon K mastersounds will be between $540-$600+
A mastersounds probably between $50-$80 cheaper.
Do call them and ask if they have any in stock first.