Gurgaon's 'final price' is never final.

My lease ends in 3 months and I'm totally fed up of renting. EMI vs rent math makes sense now, but Gurgaon's property market feels like a maze. I'm looking at a 2BHK in Sector 53, maybe something from NKV Groups. Builders quote one price, but then PLC, maintenance advance, IFMS, OC charges... yaar, kitni cheezein hain? Matlab, what's the actual all-in cost? Is it normal for builders to spring these huge hidden charges right before possession? My budget is around 1.5 Cr, but this 'final price' game is making me nervous. How do you guys factor in these surprises?