you can try this ancient trick.
dun straight away ask for 2 sets yet.
ask for the price (of cos from a reputable shops, get quotes from 2 shops that is most reasonable and you willing to pay, dun ask why, read more) first.
ask for this cam and be ready to pay at the counter... then suddenly shot the sales person a question, do u get discount if u get another set at the same time.
if the sales person accept, good for you
if the sales person says no. then say, sorry i change my mind, cos the other shop offer me some discount, so i thought you will also, then just walk off (LL, you got to go to the second shop with the price quote you willing to pay and buy from there).
anyway this trick often works in thailand, but rare in singapore.
