The only under 2K price for iphone 6S / 6S+ are demo set but no sane man selling their demo phone under 2K though. Cheapest I can find the demo set people sell at RM2300 nego in mudah. Looks like someone got it less than 1 day.

Early this month there was a warehouse sale that sell iphone 6S 16GB for RM1599 and 6S Plus 16GB for RM1849. It's a demo set which come with fullset without earpiece but with warranty.
A really good bargain, once a year there will be a warehouse sale from Machines.

And some people sold it in Mudah for a quick bucks, that's what I saw people selling it the demo set for RM2300+ negotiable. It sold for less than 1 day advertised. Perhaps few hours only as most people don't know there is a warehouse sale sold for RM1599. Or maybe they know but don't have time to go.

For demo set iphone 6 16GB, the price was RM1349.
Just for your info, remember the iphone 6/6+ are bendable, right?
But for iphone 6S/6S+ are more sturdy then the previous gen. The only downside with the current gen, the color is easier to peel off !
I always take care of my phone, lately when I tried to clean up the dust that built up around the corner and gap between case and phone, I noticed there are some discoloring at the screw, speaker and charging port parts !
Will become very bad if you put a sticker on it and peel it off later. Or even worse if you use metal bumper.

When it's discoloring, it will shows the silver-metal color under the phone color.