Any thing in piticular that you are looking for in Singapore? BC, Computer, lights, camera gear?
A quick list of shops to call.
Bluewave - 6557 2702 (wetsuits, BC, dive trips, computers)
Blue Manata - 6344 9626 (tech dive trips, tech gear, dive books, tech training)
DeepBlue - 6557 2705 (wetsuits, BC, dive trips, computers)
DiveMasters - 6226 0991 (force fins, regs, wetsuits, gear bags)
Friendly Waters - (wetsuits, BC, dive trips, computers) 6557 0016
Oceanic - (wetsuits, regs, BC, dive trips, computers) - 6391 1420
Paris - (wetsuits, BC, computers, misc gear) - 6737 3628
Richmond - (wetsuits, BC, computers, misc gear) - 6295 0377
Sea-Land Sports - (wetsuits, computers, misc gear) - 6235 3377
Waikiki - (wetsuits, BC, dive trips, computers, training) - 6291 1290
World of Sport - (wetsuits, computers, misc gear) - 6735 4922
The best from the list are BlueManata, Paris and Oceanic.
Good luck.