Nah... maybe TS want to have fun bargaining.
So in that case, go to shops in Lucky Plaza and Sim Lim. If you do your homework well enough and know approximately the price of the cam you are getting, then you can try bargaining with those black shops. Who knows, you might get good price.
If you think that is too risky... then stick to the reputable shops (names and contacts can be found in our price guide section).