Satyam Developers Shivalik: hidden charges are no joke

Shivalik — honestly, the prices there are just wild. Just checked out a 3BHK from Satyam Developers. The listed price was around ₹3.5 Cr, already pushing my budget. But then they hit me with all these 'additional charges' for PLC, parking, and some weird 'club membership' fee that wasn't clear upfront. Feels like a bait and switch, adds another 15-20 lakhs easily. I tried negotiating, but the sales guy acted like prices are fixed. Is it even possible to knock off anything substantial in this market, or are builders like Satyam just rigid? My parents keep saying 'always negotiate 10%', but that seems impossible here. What's a realistic expectation? And what other hidden costs should I be aware of before getting trapped?