Popular Bookstore is one of the bigger local bookstores... And did a search on there, and found the book (though it shows a 5th edition as opposed to the latest edition 6) and the malaysian version too...

https://www.popular.com.sg/jsp/produ...ORD=makansutra

If u die die must get the latest edition, u can try here...

http://www.selectbooks.com.sg/getTitle.cfm?SBNum=39619