the backup in singapore (if priceline doesn't work) is the ymca international house which is probably the plushest ymca in the world. it's at the very start of orchard, not far from raffles

see
http://www.tripadvisor.com/Hotel_Rev...82.hwoink_html

http://www.ymcaih.com.sg/

alternatively try priceline, see biddingfortravel.com