The real negotiation game in Gurgaon properties

Does anyone actually manage to negotiate builder prices in Sector 82? NS Arcus mein dekh raha tha, but they're firm on rates. Brokers bolte hain ho jaayega, but later it's always 'no discount sir'. Kya secondary market mein negotiation better hoti hai? Yaar, yeh hidden charges at possession time bhi darr lagta hai. Kitna extra lag jaata hai?