Fixed costs eating into my Greater Noida investment?

What's the real story with the 'all-in' price vs what you actually pay for a flat in Greater Noida? I'm so fed up of renting, landlord ne rent badha diya phir se, so finally taking the plunge. Been looking at some CRC Group projects around Sector 37, properties seem decent. My budget is around 80L for a 2BHK. But jab broker total cost batate hain, it's always like 10-12% extra for stamp duty, registration, PLC, parking. Does anyone actually manage to negotiate *these* charges, ya phir builder sirf base price pe hi discount deta hai? This significantly impacts the total acquisition cost for an investor like me. Matlab, is there any way to bring down the final out-of-pocket amount beyond just the property value? Or are these fixed costs non-negotiable? Trying to figure out the actual ROI.