M3M Sector 92: negotiation ka asli scene kya hai?

₹1.8 Cr for a 3BHK in M3M Sector 92, quoted price hai. Main khud real estate mein hoon, but for my own flat, negotiation ka scene samajh nahi aa raha. Builders bolte hain fixed price, but off the record kitna discount milta hai actually? Aur possession par hidden charges, like IFMS ya extra PLC, kitne add hote hain? Koi experience share karega?