Negotiating is not just about numbers, it is also about relationships. You want to establish rapport and trust with your vendors and suppliers, so that they are more willing to work with you and offer you better deals. You can do this by being respectful, professional, and courteous in your communication, showing interest in their business and expertise, and expressing appreciation for their service. You should also be clear and honest about your goals, constraints, and expectations, and avoid making unrealistic or unreasonable demands.