According to the internet:
420, North Bridge Rd, #01-20, North Bridge Centre (Tel: 6338
5494)
(opposite the construction site of the new National Library)
AND
Jurong East St 21, #03-27/28, IMM Building (Tel: 6561 1193)
(beside the food court on Level 3)
(Another outlet is slated to open some time next year.)