Noida builders' 'no negotiation' policy is a total myth.

Spent the whole Sunday checking out options in Sector 3 Noida Extension, especially Braventa Infra projects. Builder bol raha hai no negotiation, but I'm not sure. Is it true, ya Noida mein still some room for price adjustment hota hai? And total cost mein hidden charges kitne add hote hain, jab possession milega? Koi experience share karega?