Shopping in Singapore is relatively safe as there are rigorous measures implemented to make sure that locals and tourists alike will not be cheated. However, there may be some boundaries that are not so clearly defined.
Places where visitors must be more careful include Lucky Plaza, Sim Lim Square and Newton Food Centre. The main problems that tourists face include being ripped off by retailers or paying for accessories that should have been part of the full price.
There are a few ways to get around this. You could avoid it completely and go to more reputable places such as Funan DigitaLife Mall, Best Denki or Harvey Norman. Alternatively, if you have a friend in Singapore, it would be great for him to come along with you, and warn you if you're about to be scammed.
A third way would be to do your research. Check around for the prices of the items in reputable shops so you have an estimate of how much such an item would usually cost, and ask if the accessories are included in the price.
If you go to Newton Food Centre and touts lead you to a table, be sure to ask for the prices before you order. Ask to see a menu before deciding, or just say no and do the legwork yourself.
If all else fails, go down to CASE (Consumers Association of Singapore) or the Small Claims Tribunal (SCT) to lodge a complaint.
How to Avoid Getting Scammed