just to share:
http://www.citibank.com.sg/singapore/gcb/english/cc/gourmet/gpbflash.htm

technically this is supposed to be for singapore-issued citibank cards only i think, but i've managed to score 100% at at least 4 or 5 places with my citi-aadvantage card (maybe because i look, well, AM singaporean) so... in case any of you are interested, although these aren't exactly authentic singaporean places, but anyway.

only runs till aug 31