Ghaziabad home search: Negotiation reality check

Ghaziabad mein builder negotiation kitna possible hai? AU Real Estate ke Sector 6 project mein 2BHK dekh raha hoon. Sales guy bolta fixed price, no discount. Is this true for Ghaziabad market? Aur PLC, floor-rise premium jaise hidden costs kitne add kar dete hain final price pe? Fed up of renting, want to make a smart move.