Image from http://www.saladstop.com.sg
Lots of salad bars have sprung up around Raffles Place, and the demand has definitely warranted the truckloads of fresh vegetables being delivered here everyday. SaladStop! is a player that has (I think) the most outlets around Singapore, and there are two just in the Raffles Place area. It is currently my favourite, just for offering the most bang for your buck.