Shalimar Bagh 3BHK: My negotiation dilemma

Does anyone actually get solid discounts from builders like DPB Buildwell in Shalimar Bagh? I'm eyeing a 3BHK there, around ₹2.2 Cr. I work in real estate, so I know the listed price isn't the final word, but what's a realistic negotiation margin in Delhi right now? 5%? 10% off the base price? Also, is it smarter to approach them directly or use a broker for a better deal? Sometimes pre-launch offers feel like a trap. What's the community's honest experience on this, especially for end-users?