My own Faridabad flat hunt – negotiation reality check

Faridabad mein builder se negotiation kitni real hai? Goyal Estate Agency, Sector 35, mein 3BHK dekh raha hoon. I work in real estate, but even I'm shocked by their rigidity. Spot discount is mostly a gimmick, I feel. Has anyone managed to knock off 5-7%? What's the *real* negotiation room beyond their price?