wads the age you r lookin at??
As far as i know, rompers for babies are common, those for bigger babies are not so common (10 months and above)
Kiddy palace, OG, mums and babes (AMK Hub) all sell rompers.
Not sure if you know of this kiosk at China Square Central, Name is Re Kidz. near to Ya Kun. They sell plenty of rompers at cheaper prices coz they are kiosks...they have been around for more than 5 years.