Noida Extension spot discounts are a myth — prove me wrong

Are builders in Noida Extension actually negotiating on prices, or is it just a show? I'm fed up of renting, finally taking the plunge. Looking at a 3BHK around Sector 71, maybe Divyansh Infraheight. Everyone says prices are firm, but as an investor, I feel there's always some room for a spot discount. Kitna realistically expect kar sakte hain? And what about hidden charges at possession? Suna hai ki PLC ya maintenance ki extra costs aati hain. Real mein kitna extra padta hai, especially for an investor looking at total acquisition cost?