Ghaziabad investors — real negotiation room for new builds?

Since last year, I've been eyeing properties in Ghaziabad, even though I'm in this business. Buying my own 3BHK, maybe around Indirapuram or even Afzalpur, feels totally different. I know builder tricks, but for Wall Rock Infratech or even ATS, negotiation kitna possible hai? They always say 'fixed price', but in this market, surely there's some room for a good 5-7% off, right? Also, what's the real all-in cost? PLC, parking, stamp duty ke alawa, any hidden charges that pop up late? Buying secondary market mein better deal milti hai kya compared to new, especially for an investor looking at a 80-90L budget? Not sure if pre-launch offers are actually better value sometimes.