My 3BHK upgrade: Gurgaon builders and their 'final' prices

Been looking for 6 months now for a 3BHK in Gurgaon, upgrading from my 2BHK in Sector 82. Builders like Unitech (yaar, their U Block projects were something else) and even M3M on Golf Course Extension Road quote insane prices. Matlab, negotiation ka scope kitna hota hai? They say 'spot discount' but then add PLC, or the super area feels inflated. Is it even possible to get a genuine 5-7% off on a 2.5 Cr flat? Or is it all just a charade?